An Etymological Dictionary of Astronomy and Astrophysics
English-French-Persian

فرهنگ ریشه شناختی اخترشناسی-اخترفیزیک

M. Heydari-Malayeri    -    Paris Observatory

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Number of Results: 13176 Search : in
cross disperser
  پاشنده‌ی ِ چلیپایی، ~ خاجی   
pâšande-ye calipâyi, ~ xâji

Fr.:   

A device producing cross dispersion.

cross; → disperser.

cross dispersion
  پاشش چلیپایی، ~ خاجی   
pâšeš-e calipâyi, ~ xâji

Fr.: dispersion croisée   

Dispersion of a light beam by using two dispersing elements (grating, grism), one for separating spectral orders, the other for resolving spectral features within an order.

cross; → dispersion.

cross identification
  ایدانش ِ چلیپایی   
idâneš-e calipâyi

Fr.: identification croisée   

The identification of an object in a data base or catalog and matching it with the same object identified in another catalog.

cross; → identification.

cross product
  فر‌آورد ِ برداری   
farâvard-e bordâri

Fr.: produit vectoriel   

Same as → vector product.

cross; → product.

cross reference
  بازبرد ِ دوسویه، ~ چندسویه   
bâzbord-e dosuyé (#), ~ candsuyé (#)

Fr.: référence croisée   

Reference from one part or element of a book or data catalog to something in another for further information.

cross; → reference.

cross section
  سکنج‌گاه   
sekanjgâh

Fr.: 1) section plane; 2) section efficace   

1) Math: The intersection of a plane with a geometric figure, usually at right angles to an axis of symmetry.
2) Physics: A quantity that expresses the effective area that a given particle presents as a target to another incident particle, giving a measure of the probability that the incident particle will induce a particular atomic or nuclear reaction. Also called collision cross section. The cross section has the dimensions of a surface. In nuclear and particle physics, the commonly used units for the cross section are the barn and cm2.

In classical mechanics, the cross section for the collision of a point particle with a hard sphere is just be the surface of a section through the middle of the sphere. This explains the name "cross section." → cross; → section.

cross-dispersing spectrograph
  بیناب‌نگار با پاششِ چلیپا‌یی، ~ ~ ~ خاجی   
binâbnegâr bâ pâšeâš-e chalipaayi, ~ ~ ~ xâji

Fr.: spectrographe à dispersion croisée   

A spectrograph that utilizes cross dispersion.

cross; → dispersion; → spectrograph.

crosshairs
  تاربست   
târbast (#)

Fr.: réticule   

A system of two perpendicular fine threads of wire placed in the focus of the eyepiece of an optical instrument and used as a sighting reference.

cross; → hair.

Târbast, from târ + bast. The first component târ "thread, string, wire," cognate with tanidan, tan- "to spin, twist, weave," → tension; the second component bast "to bind; to arrange" (past stem of bastan, from Mid.Pers. bastan/vastan "to bind, shut," → band.

crossing time
  زمان ِ گذر   
zamân-e gozar (#)

Fr.: temps de traversée   

A concept used for checking the stability of a group of mass such as a → cluster of galaxies or a → star cluster. The crossing time is given by tc = R/V, where R is the average projected radial distance of group members from the center of mass and V the Gaussian dispersion in internal velocity.

cross; → time.

crow
  زاغ   
zâq (#)

Fr.: corneille   

Any of several large oscine birds of the genus Corvus, of the family Corvidae, having a long, stout bill, lustrous black plumage, and a wedge-shaped tail (Dictionary.com).

O.E. crawe, imitative of the bird's cry; cf. O.Saxon kraia; Du. kraai; O.H.G. chraja; Ger. Kräke; L. corvus "a raven," Gk. korax; cognate with Pers. kalâq, → raven.

Zâq "crow, raven," of unknown origin.

crowd
  ۱) چپیره؛ ۲) چپیریدن   
1) capiré (#); 2) capiridan

Fr.: 1) foule, multitude; 2) entasser   

1a) A large number of persons gathered closely together; throng.
1b) Any large number of persons.
1c) Any group or set of persons with something in common.
2) To gather in large numbers; throng; swarm (Dictionary.com).
crowded, → crowded field, → crowding.

M.E. crowden, from O.E. crudan "to press, crush;" akin to M.Du. cruden "to press, push," M.H.G. kroten "to press, oppress," Norwegian kryda "to crowd."

Capiré (Dehxodâ), variants cabiré, capar "crowd, troop, people gathered for something." Capiré, from capir, from capar, ultimately from Proto-Ir. *ui-par-, from *par- "to fill;" cf. Av. pər- "to fill, stuff with," pouru- "full, much, many;" O.Pers. paru- "much, many;" Pers. anbâr "ricks, storehouse," por, bol "full, much, many;" PIE *pel- "to fill;" → population.

crowded
  چپیرناک، چپیریده   
capirnâk, capiridé

Fr.: encombré, bondé   

Filled so that there is little or no room for anyone or anything else. → crowded field.

Past participle of → crowd.

crowded field
  میدان ِ چپیرناک   
meydân-e capirnâk

Fr.: champ encombré   

An area on the sky where a large number of objects, commonly stars, are seen gathered together, usually as revealed by imaging.

crowded; → field.

crowding
  چپیرش، چپیرناکی   
capireš, capirnâki

Fr.: encombrement   

1) The state or action of filling a particular place in large numbers.
2) For a → field of view, state of containing a large number of objects.

Verbal noun of → crowd.

crowdsourcing
  چپیره‌خنی   
capiré-xani

Fr.: crowdsourcing   

The process of procuring needed services by soliciting a large group of people outside the demanding company, society, or institute. Two examples of crowdsourcing in astronomy involve → variable star studies and search for → meteorites.

Combination of → crowd and → outsourcing.

crown glass
  کرون، شیشه‌ی ِ ~   
crown, šiše-ye ~ (#)

Fr.: crown, crown-glass   

An optical, alkali-lime glass which is harder than → flint glass, and has a lower → index of refraction and lower → dispersion. It is used in the production of → compound lenses.

Such named because of the crown-like shape given to the blank after the process of blowing the glass; M.E. coroune, from O.Fr. corone, from L. corona "crown," originally "wreath, garland;" cf. Gk. korone "anything curved, kind of crown;" → glass.

Crussard curve
  خم ِ کروسار   
xam-e Crussard

Fr.: courbe de Crussard   

A curve, on the pressure versus specific volume plane, representing the locus of all the theoretically possible states that can be attained by the → detonation products of an → explosive. The Crussard curve relates to the → Hugoniot curve through a translation caused by the chemical energy liberated during the detonation. The Crussard curve consists of several portions characterizing various burning regimes: detonations (strong and weak), a forbidden region, and → deflagrations (weak and strong).

Named after the French engineer Jules Louis Crussard (1876-1959), who conducted several pioneering studies in mining techniques, in particular on shock waves (Ondes de choc et onde explosive, Bulletin de la Société de l'industrie minérale de Saint-Etienne, 4e série, tome VI, 1907); → curve.

crust
  پوسته   
pusté (#)

Fr.: croûte   

Any more or less hard or stiff outer covering or surface. → Earth's crust.

M.E., from O.Fr. crouste from L. crusta "rind, crust, shell, bark;" cf. Skt. krud- "make hard, thicken;" Av. xruzdra- "hard;" Gk. kryos "icy cold," krystallos "ice, crystal;" Lett. kruwesis "frozen mud;" O.H.G. hrosa "ice, crust;" O.E. hruse "earth;" PIE base *kreus- "to begin to freeze, form a crust."

Pusté, → shell.

Crux
  چلیپا   
Calipâ (#)

Fr.: Croix   

The Southern Cross. A small but brilliant → constellation in the southern hemisphere, at 12h 30m right ascension, 60° south declination. Also known as → Southern Cross. The constellation contains four bright stars so situated that they depict the extremities of a Latin cross. Abbreviation Cru; genitive Crucis.

L. crux "cross, gibbet" is a rendering of the Gk. stauros "an upright stake or pole," in the Vulgate, the Latin translation of the Bible attributed to Saint Jerome at the end of the fourth century A.D.

Calipâ, loanword from Aramean.

cryogenics
  زمزاییک، زمزایی   
zamzâyik (#), zamzâyi (#)

Fr.: cryogénie   

A branch of physics that studies the methods of producing very low temperatures (below 150 °C) and the behavior of materials and processes at those temperatures.

From cryo- "freezing" + -gen(y) "having to do with production" + -ics.
Cryo-, from Gk. kryos "icy cold," krystallos "ice, crystal," PIE base *kreus- "to begin to freeze, form a crust;" cf. L. crusta "crust, shell, bark," Skt. krud- "make hard, thicken;" Av. xruzdra- "hard," Lett. kruwesis "frozen mud;" O.H.G. hrosa "ice, crust;" O.E. hruse "earth."
-geny, from Gk. geneia, from genes "born," cf. Av. zan- "to bear, give birth to a child, be born," infinitive zazâite, zâta- "born," cf. Skt. janati "begets, bears," L. gignere "to beget," PIE base *gen- "to give birth, beget."
-ics.

Zamâzâyik, from zam "cold (weather)" + zâyi "generating" + -ik.
Mod.Pers. zam "cold," Mid.Pers. zam "winter," Av. zimô "winter," Skt. hima- "cold, frost," Ossetic zymæg/zumæg "winter," Gk. xeimon "winter," L. hiems "winter," Lith. ziema "winter," PIE *gheim- "snow, winter."
Zâyi, from zâ- present tense stem of zâdan "to give birth," Mid.Pers. zâtan, Av. zan- "to bear, give birth to a child, be born," infinitive zazâite, zâta- "born," cf. Skt. janati "begets, bears," L. gignere "to beget," PIE base *gen- "to give birth, beget," as above.
-ics.

<< < -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 > >>