An Etymological Dictionary of Astronomy and Astrophysics
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فرهنگ ریشه شناختی اخترشناسی-اخترفیزیک

M. Heydari-Malayeri    -    Paris Observatory

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Number of Results: 13176 Search : in
snow crystal
  بلور برف   
bolur-e barf

Fr.: cristal de neige   

An → ice crystal forming snow in a → cloud.

snow; → crystal.

snow line
  مرز ِ یخ، یخ-مرز   
marz-e yax, yax-marz

Fr.: limite de glace   

In a → protoplanetary disk, the limit between the regions where water is gaseous and the region where it is cold enough for water to become ice. The core accretion theory predicts that → giant planets form just outside the snow line where they can accrete enough rock and ice to generate a core. Subsequently the core grows into a gas giant like → Jupiter or → Saturn via the → accretion of hydrogen and helium. The snow line location depends on the → luminosity of the central star. For solar system it is about 5 AU, the position of Jupiter. Also known as ice line.

snow; → line.

Marz, → frontier; yax, → ice.

snowball
  برف-گوله   
barf-gule

Fr.: boule de neige   

A mass of snow packed into a ball or rolled together, as for throwing.

snow; → ball.

snowball Earth
  زمین ِ برف-گوله   
Zamin-e barf-gule

Fr.: Terre boule de neige   

Any of several episodes in the history of the Earth where our planet was entirely covered by glacial ice from pole to pole. There are at least three such episodes. The first one, called the Huronian glaciation, extended from 2.4 billion years ago to 2.1 billion years (lasting about 300 million years). In the last billion years, the Earth has experienced two more global glaciations: the Sturtian glaciation, which began 720 million years ago and, following a brief interglacial episode, the Marinoan glaciation, which ended 635 million years ago. During such episodes the global mean temperature would be about -50°C because most of the Sun's radiation would be reflected back to space by the icy surface. The average equatorial temperature would be about -20°C, roughly similar to present Antarctica. Without the moderating effect of the oceans, temperature fluctuations associated with the day-night and seasonal cycles would be greatly enhanced. Because of its solid surface, the climate on a snowball earth would have much in common with present Mars (http://www.snowballearth.org).

The term snowball Earth was coined in 1989 by Joe Kirschvink, a biomagnetist and paleomagnetist at the Caifornia Institute of Technology in Pasadena, USA; → earth.

snowdrift
  برف-راند   
barf-rând

Fr.: congère   

A mound or bank of snow deposited as sloping surfaces and peaks, often behind obstacles and irregularities, due to eddies in the wind field.

snow; → drift.

Barf-rând "snowdrift, drfited snow" from barf, → snow, + rând "driving, drfit; drifted," from rândan "to push, drive, cause to go," causative of raftan "to go, walk, proceed" (present tense stem row-, Mid.Pers. raftan, raw-, Proto-Iranian *rab/f- "to go; to attack"); barf-e bâd âvard "snow brought by wind," from barf + bâdwind + âvard, short for âvardé "brought," p.p. of âvardan "to bring; to cause, produce" (Mid.Pers. âwurtan, âvaritan; Av. ābar- "to bring; to possess," from prefix ā- + Av./O.Pers. bar- "to bear, carry," bareθre "to bear (infinitive)," bareθri "a female that bears (children), a mother;" Mod.Pers. bordan "to carry;" Skt. bharati "he carries;" Gk. pherein; L. fero "to carry").

snowflake
  گلیچ ِ برف، دانه‌ی ِ ~   
golic-e barf, dâne-ye ~

Fr.: flocon de neige   

An agglomeration of many → ice crystals that falls as a unit from a cloud. Snowflakes possess a six-fold symmetry that ultimately derives from the six-fold symmetry of the ice crystal lattice. Typical snowflakes fall at a rate of 1-2 m s-1. The shape of snowflakes is influenced by the → temperature and → humidity of the atmosphere. Snowflakes form in the atmosphere when cold water droplets freeze onto dust particles. Depending on the temperature and humidity of the air where the snowflakes form, the resulting ice crystals will grow into a myriad of different shapes. Snowflakes formed in temperatures below -22 °C consist primarily of simple crystal plates and columns whereas snowflakes with extensive branching patterns are formed in warmer temperatures. Snowflakes are not frozen raindrops. Sometimes raindrops do freeze as they fall, but this is called → sleet. Sleet particles do not have any of the elaborate and symmetrical patterning found in snow crystals.

From → snow + flake, from M.E. akin to O.E. flac- in flacox "flying" (said of arrows), O.N. flakka "to wander," M.Du. vlac "flat, level," M.H.G. vlach, Ger. Flocke "flake."

Golic "snowflake" in dialectal Lori and Laki (originally *geli-ka), variants Laki gal "seed (of millet)," gella "grape berry," Torbat-Heydariyei gella "grape berry," golla "ball, reel," Kurd. kuli, kilole "snowflake," Malâyeri gulu "bead," Qâyeni golle "bead," Qasrâni gella, golla "bead," Tabari gəlilə "bead," Gilaki gudé "ball, bowl, tumour," literary Pers. golulé, goruk "ball;" cf. Skt. guda- "ball, mouthful, lump, tumour;" Pali gula- "ball;" Gk. gloutos "rump;" L. glomus "ball," globus "globe;" Ger. Kugel; E. clot; PIE base *gel- "to make into a ball;" barf, → snow; dâné, → grain.

snowplow
  برفروب   
barfrub (#)

Fr.: chasse-neige   

A piece of equipment mounted on the front of a vehicle for clearing away snow from roads, railroad tracks, etc.

snow + plow, → Plough.

Barfrub, from barf, → snow, + rub, rubidan "to sweep," → scan.

snowplow phase
  فاز ِ برفروب   
fâz-e barfrub

Fr.: phase de chasse-neige   

The third phase in the evolution of a → supernova remnant (SNR) occurring after the → Sedov-Taylor phase when the mass of the swept-up material becomes much larger than the amount of the ejected material. The SNR is surrounded by a cool → shell of accumulated material that is being pushed from behind, similar to what occurs for a snowplow. During this phase, → radiative cooling becomes important and the total energy is no longer conserved. Also called the → radiative phase.

snowplow; → phase.

SNR shell
  پوسته‌ی ِ بازمانده‌ی ِ اَبَر-نوختر   
pustey-e bâzmânde-ye abar-now-axtar

Fr.: coquille de reste de supernova   

A ring-like structure of swept-up → gas and → dust around a → supernova remnant. See also: → free expansion phase, → Sedov-Taylor phase, → snowplow phase.

supernova remnant (SNR); → shell.

Sobolev approximation
  نزدینش ِ سوبولف   
nazdineš-e Sobolev

Fr.: approximation de Sobolev   

A method allowing for a simplified solution to the → radiative transfer equation at frequencies of spectral lines in media moving with a high velocity gradient. This method assumes that the macroscopic velocity gradients are more important than local random variations of thermal line width: dv/dr > vth/l, where dv/dr is the velocity gradient, vth is the thermal broadening of the line, and l the length scale. The Sobolev approximation is only valid if the conditions of the gas do not change over the → Sobolev length. Under the Sobolev approximation, each point in the medium is isolated from other points, and the → radiative transfer problem becomes a local one and therefore much easier to solve.

Named after the Russian astronomer Viktor Viktorovich Sobolev, Moving Envelopes of Stars [in Russian], Leningr. Gos. Univ., Leningrad (1947) [translated by S. Gaposchkin, Harvard Univ. Press, Cambridge, Mass. (1960)]; → approximation.

Sobolev length
  درازای ِ سوبولف   
derâzâ-ye Sobolev

Fr.: longueur de Sobolev   

In the → Sobolev approximation, the length over which the conditions of the gas do not change and the approximation is valid. It is expressed by: ls = vth/(dv/dr), where vth is the thermal line width and (dv/dr) the velocity gradient. In other words, the length over which the profile function of a line is shifted through a distance equal to its own width by the macroscopic velocity gradients that exist in the moving medium.

Sobolev approximation; → length.

social
  هزانه‌ای   
hazâne-yi

Fr.: social   

Of or pertaining to human society.

society; → -al.

socialization
  هزانش   
hazâneš

Fr.: socialisation   

A continuing process whereby an individual acquires a personal identity and learns the norms, values, behavior, and social skills appropriate to his or her social position (Dictionary.com).

socialize; → -tion.

socialize
  هزانیدن   
hazânidan

Fr.: socialiser   

To make social; make fit for life in companionship with others (Dictionary.com).

social; → -ize.

societal
  هزانی   
hazâni

Fr.: sociétal   

Of or pertaining to social groups, their activities, or to social relations.

From societ-, from → society, + → -al.

Hazâni, from hazân-, from hazâné, → society, + -i, → -al.

society
  هزانه   
hazâné

Fr.: société   

An organized group of persons associated together for scientific, cultural, or other purposes; e.g. a physical society. See also:
associate, → association, → dissociate, → dissociation, → social, → socialization, → socialize, → societal.

M.E., from O.Fr. societe, from L. societatem (nominative societas), from socius "companion," → associate.

Hazâné, from Av. hacenay- "getting together, association," from verb hac-, hax- "to associate, follow, accompany" (haxay-, hašy-, haš- "friend"), hacaiti "follows;" hacā "from, out of;" O.Pers. hacā "from" (Mid.Pers. hac "from;" Mod.Pers. az "from"); PIE base *sekw- "to follow;" cf. Skt. sac- "to be associated or united with," sácate "accompanies, follows," sácā "with;" Gk. hepesthai "to follow;" L. sequi "to follow."

sociology
  هزانه‌شناسی   
hazâne-šenâsi

Fr.: sociologie   

The science or study of the origin, development, organization, and functioning of human society; the science of the fundamental laws of social relations, institutions, etc. (Dictionary.com).

society; → -logy.

Socratic
  سقراطی، سقراتی   
Soqrâti

Fr.: socratique   

Of or pertaining to Socrates or his philosophy, followers, etc., → Socratic irony, → Socratic method.

Socrates (469?-399 B.C.), Athenian philosopher.

Socratic irony
  گواژه‌ی ِ سقراطی، ~ سقراتی   
govâže-ye Soqrâti

Fr.: ironie socratique   

A means by which the pretended ignorance of a skillful questioner leads the person answering to expose his own ignorance (Collins).

Socratic; → irony.

Socratic method
  روش ِ سقراطی، ~ سقراتی   
raveš-e Soqrâti

Fr.: méthode socratique   

The use of questions, as employed by Socrates, to develop a latent idea, as in the mind of a pupil, or to elicit admissions, as from an opponent, tending to establish a proposition (Dictionary.com).

Socratic; → method.

<< < -es -it -sc 201 951 abe abs abs aca acc acc aco act ada adh ado aer aft air Alf alg alk alp Alt alt amb ana And ang ani ann ant ant ant apo app app Apu arc arg Arn art ass ast ast ast atm ato att aur aut avo azi bac bal bar bar bat Bea Bel bet bia big bin bio Bir bla bla blo Blu bol Boo bou box bre Bri bro bur cal cal Can cap car Car cat cau cel cen cen cha Cha cha che Chi chr cir cir civ cla clo clo CMB coa coe coh col col col com com com com com com com com Com con con con con con con con con con con con con coo cor cor cor Cos cos cos cou cou cra cri cro cry cul cur cyc D l dar dat day dea dec dec dec def def deg Del Den dep der det deu dew dic dif dif dil dip dir dis dis dis dis dis diu dog Dop dou Dra Dsc dus dwa dyn Dys Ear ecc eco edg egg Ein Ela ele ele ele ele ell eme emp enc eng ent epi equ equ equ eru eth Eur eve exa exc exe exi exo exp ext ext ext fab fai Fan fea fem fer fie fil fir fir fla fli flu foc for for for fra fre fre fri fun fuz gal gal gal Gam gau Gau gen geo geo geo geo Gib glo gov gra gra gra gra gre gro Gui H-a hal Ham har Hay hea hei hel Hel her het hie hig hoa hom hor hot Hub Hug hur hyd hyd hyl hyp ice ide ima ima imp imp inc inc ind ine inf inf inf ing inn ins ins int int int int int int int int inv inv ion iro Isl iso iso Jab jet Jov Jup Kar Kep kil Kip Kra Lag Lam Lan Lar las law lea Leg Leo lev lig lim lin lin lin lit loc loc log Lor low lum lun lun Lym Mac mag mag mag mag mag mai Mal map mas mas mat Mau mea mea med Men mer Mes Met met mic mic Mie mil min Mir mix mod mol mom Moo mor mov mul mur n-b nan nat nea neg Ner neu new New NGC noc nom non non nor nor nuc nuc nul nut obj obl obs occ oct off old one ope opp opt opt orb ord org Ori osc oth ove Owl P-s Pal par par par par Pas pat pec pen per per per per per Pha pha pho pho pho phy pie pix Pla pla pla pla Pli Poi pol pol pol pol por pos pos pow pre pre pre pre pri pri pri pro pro pro pro pro pro pro pub pul pyc qua qua qua qua qui rad rad rad rad rad rad rai ran rar Ray rea Rea rec rec red red ref ref reg rel rel rel ren res res res res ret rev Ric rig rin roc roo rot rot rur S5- Sal sat sca sca Sch sci Scu sec sec sed sel sel sem seq set sha she sho sid sie sil sim sin sit sky slo sno sod sol sol sol sol son sou spa spa spe spe spe spe sph spi spo squ sta sta sta sta ste ste ste Sti sto str str sub sub sub sul sup sup sup sup sur sur syl syn sys tal Tay tel ten ter tex the the the the Tho thr tid tim Tit too Tor tra tra Tra tra Tra tri Tri tru tub tur two Typ ult ult unc uni uni uni upl ura uti val var vec vel ver Ver vie vir vis vis vol W-R war wav wav wea Wei wha wid win WN3 Wol wri xen yok zen zij > >>