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

فرهنگ ریشه شناختی اخترشناسی-اخترفیزیک

M. Heydari-Malayeri    -    Paris Observatory

   Homepage   
   


A B C D E F G H I J K L M N O P Q R S T U V W X Y Z

<< < -ci cal Cam can car Car cat Cau CDM Cen cen cha cha cha che chr cir cir civ Cla clo clu co- Coc coh col Col col Com com com com com com com Com con con con con con con con con con con coo cor cor cor cos cos cot cou Cra Cre cri cro cub cur cyc cyl > >>

Number of Results: 1223
Cocoon Nebula (IC 5146)
  میغ ِ پیله   
miq-e pilé

Fr.: nébuleuse du cocon   

An emission nebula located about 3,000 light-years away toward the → constellation  → Cygnus. It is thought to be a region of active → star formation.

Cocoon, from Provençal Fr. coucoun, from O.Fr. coque "egg shell, nut shell," L. coccum "berry," from Gk. kokkos "berry, seed;" → star; → nebula.

Miq, → nebula; pilé "the silkworm's cocoon; a purse", cf. Skt. patta- "woven silk."

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.

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."

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.

coherence area
  پهنه‌ی ِ همدوسی   
pahne-ye hamdusi

Fr.: zone de cohérence   

Of an electromagnetic wave, the area of a surface perpendicular to the direction of propagation, over which the electromagnetic wave maintains a specified degree of coherence.

coherence; → area.

coherence length
  درازا‌ی ِ همدوسی   
derâzâ-ye hamdusi

Fr.: longueur de cohérence   

The distance over which an electromagnetic wave train maintains a specified degree of coherence.

coherence; → length.

coherence time
  زمان ِ همدوسی   
zamân hamdusi

Fr.: temps de cohérence   

The time over which a propagating electromagnetic wave may be considered coherent. The coherence time of an interferometer is the interval during which the fringe phase remains stable.

coherence; → time.

coherent
  همدوس   
hamdus (#)

Fr.: cohérent   

Two or more wave sources are said to be coherent sources if the phase difference between a pair of points, one in each source, remains constant.

Coherent, adj., → coherence.

coherent light
  نور ِ همدوس   
nur-e hamdus (#)

Fr.: lumière cohérente   

Light waves that have the same wavelength and possess a fixed phase relationship, as in a laser.

coherent; → light.

coherent optics
  نوریک ِ همدوس   
nurik-e hamdus

Fr.: optique cohérente   

A branch of optics that uses coherent radiation to produce holographic three-dimensional images of objects.

coherent; → optics.

<< < -ci cal Cam can car Car cat Cau CDM Cen cen cha cha cha che chr cir cir civ Cla clo clu co- Coc coh col Col col Com com com com com com com Com con con con con con con con con con con coo cor cor cor cos cos cot cou Cra Cre cri cro cub cur cyc cyl > >>