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: 13116 Search : far
cocoon star
  ستاره‌ی ِ پیله‌ای   
setâre-ye pileyi

Fr.: étoile dans son cocon   

A star hidden in a dense envelope of gas and dust which is a strong source of infrared emission.

Cocoon nebula; → star.

code
  رمز   
ramz (#)

Fr.: code   

1) A system used for brevity or secrecy of communication, in which arbitrarily chosen words, letters, or symbols are assigned definite meanings.
2) Computers: The symbolic arrangement of statements or instructions in a computer program in which letters, digits, etc. are represented as binary numbers; the set of instructions in such a program (Dictionary.com).

M.E., from O.Fr. code, from L. codex "book, book of laws," later form of caudex "tree trunk," hence "document made up of wooden tablets."

Ramz "secret writing, enigma," loan from Ar.

codeclination
  هم‌واکیلش   
hamvâkileš

Fr.: codéclinaison   

The complement of → declination; the angular distance along a great circle from the celestial pole, i.e., 90° - declination.

Codeclination, from → co- + → declination.

Hamvâkil, from ham-, → co-, + vâkil, → declination.

codex
  نبیگان   
nebigân

Fr.: codex   

A manuscript text in book form which was common before the invention of printing. The codex is the earliest known form of a bound book which replaced the scroll. It was a Roman invention. → Dresden codex.

From L. codex "book," → code.

Nebigân, from nebi / nepi / nevi "book, scripture," from Mid.Pers. nibêg "writing, scripture, book," related to neveštan, → write, + -gân suffix denoting collective nature.

codomain
  هم-دمن   
ham-daman

Fr.: ensemble d'arrivée   

The set of values that a → function is allowed to take (i.e. may possibly come out of a function), as opposed to the → range.

co-; → domain.

coefficient
  همگر   
hamgar (#)

Fr.: coefficient   

1) Math.: A number or letter placed before an algebraic expression to indicate that the expression is to be multiplied by that factor, e.g. in the expression 2 x3, 2 is the coefficient of x3. In general, any factor of a product is called the coefficient of the product of the remaining factors.
2) Physics: Factor which measures some specified property of a given substance, and is constant for that substance under given conditions, such as the coefficient of friction. → factor.

Hamgar, from ham- "together," → com- + -gar agent suffix, from kar-, kardan "to do, to make," Mid.Pers. kardan, O.Pers./Av. kar- "to do, make, build," Av. kərənaoiti "makes," cf. Skt. kr- "to do, to make," krnoti "makes," karma "act, deed;" PIE base kwer- "to do, to make."

coefficient of viscosity
  همگر ِ وشکسانی   
hamgar-e vošksâni

Fr.: coefficient de viscosité   

A quantity that indicates a property of fluids and is defined by the ratio of shearing → stress to the rate of change of shearing → strain. It is also simply called viscosity. The coefficient of viscosity is expressed by: μ = (F/A) / (dv/dy), where F is the force required to maintain a steady velocity difference dv between any two parallel layers of the fluid, A is the area of the layers, and dv/dy is the → velocity gradient between two points separated by a small distance measured at right angles to the direction of flow. The unit of viscosity is that of force times distance divided by area times velocity. Thus, in the cgs system, the unit is 1 dyne.cm/cm2.(cm/s), which reduces to 1 dyne.s/cm2. This unit is called 1 → poise.

viscosity; → coefficient.

coelostat
  آسمان داشتار   
âsmândâštâr

Fr.: coelestat   

A flat mirror with a clock-drive mounted in such a way that it moves from east to west to compensate for the apparent rotation of the Earth in order that the image of a particular area of sky remains fixed in the focal plane. See also → siderostat and → heliostat.

Coelostat, from L. coelo-, for caeli-, combination form of coelum "sky" + -stat prefix denoting something that stabilizes, keeps, fixes, from -stata, from Gk. -states "one that causes to stand," or statos "standing," from *sta- "to stand."

Âsmândâštâr, from âsmân, → sky, + dâštâr "holder, maintainer," from dâštan "to hold, maintain; to have; to possess," Mid.Pers. dâštan, O.Pers./Av. root dar- "to hold, keep back, maitain, keep in mind," Skt. dhr-, dharma- "law," Gk. thronos "elevated seat, throne," L. firmus "firm, stable," Lith. daryti "to make," PIE *dher- "to hold, support."

coerce
  پزوریدن   
pazuridan

Fr.: contraindre, forcer   

1) To compel by force, especially by law or authority.
2) To obtain through the use of force, threat, or other forms of constraint.

M.E., from O.Fr. cohercier, from L. coercere "to restrain, surround," form → com- "together" + arcere "to enclose, confine, keep off," from PIE *ark- "to hold, contain, guard."

Pazuridan, literally "to force against," from pa- "contrary to; against; opposing," → counter- + zur "power, force," → strength, + infinitive suffix -idan.

coercion
  پزورش   
pazureš

Fr.: coercition   

The act, practice, or power of using physical or moral force to compel a person to do something.

Verbal noun of → coerce.

coercive
  پزورنده   
pazurandé

Fr.: coercitif   

Serving or tending to coerce.

coerce; → -ive.

coercive field
  میدان ِ پزورنده   
meydân-e pazurandé

Fr.: champ coercitif   

Same as → coercive force.

coercive; → field.

coercive force
  نیروی ِ پزورنده   
niru-ye pazurandé

Fr.: force coercitive   

The strength of an external → magnetic field that brings to zero the → magnetic flux density of a magnetic material when that field is caused to operate in the opposite direction from the orientation of the → magnetization of the material. Also called coercivity. Coercive force is a measure of the magnetization of a → ferromagnetic material. It is usually measured in the units of → oersted or ampere/m.

coercive; → force.

coercivity
  پزورندگی   
pazurandegi

Fr.: coercivité   

1) General: The quality of being coercive.
2) Physics: Same as → coercive force.

coercive; → -ity.

coeval
  هم‌سن   
hamsenn (#)

Fr.: du même âge, contemporain   

Of the same age.

From L. co-, → com-, + aevum "age," → aeon.

Hamsenn "equally old," from ham-, → com-, + sennage.

cofactor
  همکروند   
hamkarvand

Fr.: cofacteur   

A number associated with an → element of a → determinant. If A is a square matrix [aij], the cofactor of the element aij is equal to (-1)i+j times the determinant of the matrix obtained by deleting the i-th row and j-th column of A.

co-; → factor.

cognition
  شناختار   
šenâxtâr (#)

Fr.: connaissance, cognition   

1) The mental process of knowing, including → awareness, → perception, → reasoning, and judgment.
2) The product of such a process; something thus known, perceived, etc. (Dictionary.com).

M.E. cognicioun; L. cognitionem (nominative cognitio, from cognitus p.p. of cognoscere, from → co- + gnoscere, noscere "to learn;" cognate with Pers. šenâs, šenâxt, as below.

Šenâxtâr, verbal noun of šenâxtan "to know, recognize," dânestan "to know;" O.Pers./Av. xšnā- "to know, learn, come to know, recognize;" cf. Skt. jñā- "to recognize, know," jānāti "he knows;" Gk. gignoskein "to know, think, judge;" L. gnoscere, noscere "to come to know" (Fr. connaître; Sp. conocer); O.E. cnawan; E. know; Rus. znat "to know;" PIE base *gno- "to know."

cognitive
  شناختاری   
šenâxtâri (#)

Fr.: cognitif   

1) Of or pertaining to the act or process of knowing, perceiving, remembering, etc.; of or relating to → cognition.
2) Of or pertaining to the mental processes of perception, memory, judgment, and reasoning, as contrasted with emotional and volitional processes (Dictionary.com).

cognition; → -ive.

cohere
  همدوسیدن   
hamdusidan (#)

Fr.: adhérer, être cohérent   

1) To stick together; be united; hold fast, as parts of the same mass.
2) Physics (of two or more similar substances) to be united within a body by the action of molecular forces (→ cohesion).

From L. cohaerere "to cleave together," from → com- "together," + haerere "to stick."

Hamdusidan, from ham- "together," → com-, + dusidan (Dehxodâ) "to stick, to adhere," → adhere.

coherence
  همدوسی   
hamdusi (#)

Fr.: cohérence   

The property of two or more electromagnetic waves when they are in fixed phase relationship over time. If the crests and troughs of the waves meet at the same time and place they are said to be in phase.

cohere + -ence, → -ance.

<< < -es -iv -ti 21 a p abe abs abs aca acc acc acr act ada adh Adr aer aga air Alf Alg alk Alp alt alu amm ana And ang ani ano ant ant Ap apo app app Aqu Arc arg arr asc ass ast ast asy atm ato att aur aut axi B-m bad Bal bar bar Bay Bed ber Bet bif bim bin bio bis bla ble blu Bod Bol bor bou Bra Bre bro bul C-t Cal Cam can car Car Cas cat cav cel cen cer Cha cha Cha che chl Cir cir cir Cla cli clo clu co- coc 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 Cre cri cro cub cur cyc cyl Dan dat Dav de- Deb dec dec dee def deg del Den den der det deu dew dic dif dif dil Dip dir dis dis dis dis dis diu dod Dop dou Dra dua dus dwa dyn DZ Ear ecc eco edi EHB Ein ela ele ele ele ele ell eme emp end Eng ent epi equ equ era ESP eth Eur evi exa exc exe exi exp exp ext ext ext fac fal far fec Fer fer fie fin fir fis fla Flo flu fog for for Fou fra fre fre Fro fun G s Gal gal gal Gar gau geg gen geo geo geo ger gla gly gra gra gra gra gra Gre gro GYR Had Hal hap Har HD hea hel hel Hen Her hex hig Hil hol Hoo hor hou Hub hum hyb hyd hyd hyp hys ide ign ima imp imp in- inc Ind ind ine inf inf inf ini ins ins ins int int int int Int int int int inv ion iri irr iso iso iso Jea Jor jum K c Kep Ker kin kno lab Lam Lan Lap las lat Le lef len lev lig lig lin lin lin liq Lit loc log lon lou LS lun lun Lym M s Mag mag mag mag mag mag maj man Mar mas mas mat May mea mec mel mer mes met met met mic mid mil Min Mir mix mod mod mol mon mor mov mul mur mys nan nat nav nec Nep neu New New NGC nob nom non non nor nos nuc nuc num nut obj obl obs occ oct off oli oni ope opp opt opt orb ord org orp osc out ove oxi P-w pal par par par par Pas pat pej per per per per per per pha Phe pho pho pho phy pin pla Pla pla pla pla plu poi pol pol Pol pol por pos pot Poy pre pre pre pre pri pri pri pro pro pro pro pro pro Psa pul pum Q i qua qua qua qua R A rad rad rad rad rad rad Ram Ran rat rea rea rec rec red red ref ref reg rei rel rel rem rep res res res ret rev Rho Rie ril riv rog Ros rot rul S A Sag sam sat sca sca Sch Sco Sec sec sec seg sel sem sen set Sha sha shi sho sid sig sim sin Sir ske sli Smo soc sof sol sol sol sol sou sou spa spe spe Spe spe sph spi Spi spr sta sta sta sta sta ste ste ste Sto str str sub sub sub suc sun sup sup sup sup sur swa syn syn tac tas tel tem ter tes the the the the thi thr tid til tip ton tor tou tra tra tra tra Tri tri tru tsu tur two Typ UHE ult unc uni uni uni upg 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 > >>