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
first-order predicate calculus
  افماریک ِ فراسنی ِ رایه‌ی ِ نخست   
afmârik-e farâsani-ye râye-ye naxost

Fr.: cacul des prédicats du premier ordre   

Same as → first-order logic.

first; → order; → predicate; → calculus.

first-order spectrum
  بیناب ِ رایه‌ی ِ نخست   
binâb-e râye-ye naxost

Fr.: spectre du premier ordre   

An optical spectrum, produced by a diffraction grating, in which the difference in path length of light from adjacent slits is one wavelength.

first; → order; → spectrum.

fish
  ماهی   
mâhi (#)

Fr.: poisson   

A limbless cold-blooded vertebrate animal with gills and fins living wholly in water (OxfordDictionaries.com).

M.E. fis(c)h, fyssh, O.E. fisc; cognate with Du. vis, Ger. Fisch, O.Norse fiskr, Goth. fisks; akin to L. piscis; PIE root *pisk- "a fish."

Mâhi "fish," from Mid.Pers. mâhik; Av. masya-; cf. Skt. matsya-, Pali maccha-.

fissile
  شکافت‌پذیر، شکافتنی   
šekâftpazir (#), šekâftani (#)

Fr.: fissile   

Any material that is capable of undergoing → nuclear fission by → thermal neutrons. The three primary fissile materials are uranium-233, uranium-235, and plutonium-239. Although sometimes used as a synonym for → fissionable material, this term has acquired a more restricted meaning.

From L. fissilis, from fiss(us), + -illis a suffix of adjectives expressing capability, susceptibility, liability, aptitude, etc.

Šekâftani, from šekâft, → fission + -i a suffix expressing capability, aptitude, etc.

fissile isotope
  ایزوتوپ ِ شکافت‌پذیر   
izotop-e šektpazir

Fr.: isotope fissile   

An isotope that is capable of undergoing nuclear fission after capturing either fast neutron or thermal neutron. Typical fissionable isotopes: 238U, 240Pu, but also 235U, 233U, 239Pu, 241Pu

fissile; → isotope .

fission
  شکافت   
šekâft (#)

Fr.: fission   

1) The act or process of splitting or breaking into parts.
2) Splitting of the nucleus of an atom into two or more fragments of comparable size, usually as the result of the impact of a neutron on the nucleus. Same as → nuclear fission.

Fission, from L. fissionem "a breaking up, cleaving," from root of findere "to split."

Šekâft, stem of šekâftan "to split, break, tear," akin to kaftan, kâftan "to split; to dig," Parthian Mid.Pers. q'f- "to split;" Sogdian "to split;" Chorasmian kf- "to split, be split;" Proto-Iranian *kap-, *kaf- "to split."

fission products
  فر‌آورده‌های ِ شکافت   
farâvardehâ-ye šekâft (#)

Fr.: produits de fission   

Nuclides generated by the fission of higher mass elements or by subsequent radioactive decay of nuclides directly generated by fission.

fission; → product.

fission theory
  نگره‌ی ِ شکافت   
negare-ye šekâft

Fr.: théorie de fission   

A theory that suggests the Moon was formed at the same time as Earth. A spinning Earth ejected a large piece of its material into space which then developed into the shape and orbit of the Moon. This event was also thought to be at the origin of the Pacific Ocean. This first modern idea about the formation of the Moon is due to George Darwin, the son of the great naturalist Charles Darwin. The fission theory explained the lack of volatile substances on the Earth. The volatile materials on the Earth would have been thrown out into space The fission theory is almost completely abandoned today. The analysis of lunar rocks brought to Earth by NASA astronauts showed that the Moon rocks are older than the rocks at the bottom of the Pacific Ocean. Moreover, modern → plate tectonics gives a better explanation of the origin of the Pacific Ocean. See also → giant impact hypothesis, → capture theory, → co-formation theory.

fission; → theory.

fissionable
  شکافت‌پذیر   
šekâftpazir (#)

Fr.: fissile   

The material that can be fissioned by fast neutrons, such as uranium-238. Commonly used as a synonym for → fissile material.

From → fission + → -able.

fit
  ۱) سز کردن؛ ۲) سز   
1) saz kardan; 2) saz

Fr.: 1) ajuster; 2) ajustement   

1) (v.) To pass a mathematical line or curve through data points.
2) (n.) The act of fitting.

From M.E. fitten; akin to M.Du. vitten "to befit."

Saz, from sazidan "to suit, fit, be worthy," sazâ "suitable, agreeing with, congruous, deserving of," Mid.Pers. sacitan/sazidan "to fit," sazešn "fitness," sazâg "fitting, worth;" Av. 1sak- "to understand or know a thing; to mark;" cf. Skt. śak- "to be able, powerful" śakta- "able, competent," śakti- "ability, power;" alternatively from Av. 2sak- "to go by, pass, pass away; to be up or over (of time)."

fitting
  سزکرد، سز   
saz-kard, saz

Fr.: ajustement   

The process or instance of adapting a mathematical curve to data points.

Verbal form of → fit.

fitting error
  ایرنگ ِ سزکرد، ~ سز   
irang-e saz-kard, ~ saz

Fr.: erreur d'ajustement   

The discrepancy between the mathematical curve and data points. → fit.

fitting; → error.

five
  پنج   
panj (#)

Fr.: cinq   

A cardinal number whose symbol is 5, V, or ۵.

Five, from O.E. fif, from P.Gmc. *fimfe (cf. O.S. fif, O.H.G. funf), from PIE *penkwe "five;" cognate with Pers. panj, as below.

Panj, from Mid.Pers. panj; Av. panca; cf. Skt. páñca; Gk. pente; L. quinque; E. five, as above.

five-color system
  راژمان ِ پنج‌رنگه   
râžmân-e panj-rangé

Fr.: système à cinq couleurs   

A photometric system which uses five filters, from ultraviolet to the red part of the visual spectrum: U, B, V, R and I.

five; → color; → system.

Five-hundred-meter Aperture Spherical radio Telescope (FAST)
     
FAST

Fr.: FAST   

The 500 m diameter → radio telescope which is the largest → single-dish antenna in the world. It is an Arecibo type telescope nestled within a natural basin in China's remote and mountainous Dawodang, Kedu Town, in southeastern China's Guizhou Province. The → reflector consists of 4,450 triangular panels, each with a side length of 11 m. More than 2,000 → actuators are used, according to the feedback from the measuring system, to deform the whole reflector surface and directly correct for → spherical aberration. Several detectors are used to cover a frequency range of 70 MHz to 3 GHz.

five; → hundred; → meter; → aperture; → spherical; → radio; → telescope.

fix
  برجاییدن   
barjâyidan

Fr.: fixer   

1) To make fast, firm, or stable.
2) To place definitely and more or less permanently (Dictionary.com).

M.E. fixen, probably from O.Fr. fixe "fixed," from L. fixus "fixed, fast, established, settled," p.p. of figere "to fix, fasten."

Infinitive, from barjâ, → fixed.

fixation
  برجایش   
barjâyeš

Fr.: fixation   

The act of fixing or the state of being fixed.

Verbal noun of → fix; → -tion.

fixed
  برجا   
barjâ

Fr.: fixe   

1) Fastened, attached, or placed so as to be firm and not readily movable; firmly implanted; stationary; rigid.
2) Rendered stable or permanent, as color.
3) Set or intent upon something; steadily directed (Dictionary.com).

Past participle from → fix.

Barjâ "fixed; in place; properly placed," from bar "on, upon, up," → object, + , → place,

fixed star
  ستاره‌ی ِ برجا، ~ ایستاده، ~ بیابانی   
setâre-ye barjâ, ~ istâdé, ~ biyâbâni (#)

Fr.: étoile fixe   

A → heavenly body that, in → contrast to the → planets, does not appear to change its relative → position on the → celestial sphere.

Fixed, p.p. of → fix; → star.

Setâré, → star; barjâ, → fixed.
Istâdé (Biruni in at-Tafhim) "standing," from istâdan "to stand;" O.Pers./Av. sta- "to stand, stand still; set" (cf. Skt. sthâ- "to stand;" Gk. histemi "put, place, weigh;" stasis "a standing still;" Lith. statau "place;" Goth. standan; L. stare "to stand;" PIE base *sta- "to stand");
Biyâbâni (Biruni in at-Tafhim), from Mid.Pers. awiyâbânig "fixed," from negation prefix → a- + wiyâbânig "wandering," from wiyâbân "deluded, seduced," wiyâbânênidan "to lead astray, deceive," from Av. vi- "apart, away from, out" (O.Pers. viy- "apart, away;" cf. Skt. vi- "apart, asunder, away, out;" L. vitare "to avoid, turn aside") + dab- "to deceive;" cf. Skt. vimugdha- "confused, bewildered," vimohita- "confused, infatuated." Note that biyâbân "desert" is from an other origin.

Fizeau test
  آزمون ِ فیزو   
âzmun-e Fizeau

Fr.: test de Fizeau   

The determination of the shape of an optical surface by means of → interferometry using a → fringe pattern formed with respect to a reference surface.

Named after the French physicist Armand Hippolyte Louis Fizeau (1819-1896), see also → toothed-wheel experiment; → test.

<< < -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 > >>