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: 678
divergence
  واگرایی   
vâgerâyi (#)

Fr.: divergence   

1) The act, fact, or amount of diverging.
2) Math.: A differential → operator that, for a three-dimensional vector function F(x,y,z), is the sum of the → scalar products of the unit vectors and the partial derivatives in each of the three component directions. It is written as div F or ∇ . F = (∂F/∂x)i + (∂F/∂y)j + (∂F/∂z)k, ∇ being the → del operator or → nabla. The divergence of a vector field is a → scalar field. In physics, this operator is used to derive the amount of flux per unit volume leaving an infinitesimal element of volume at a point in a vector field. For example, in an electrostatic field, the divergence of the field is zero unless the volume element contains an electric charge.

From diverge, → diverge, + -ence a noun suffix.

Vâgerâyi, from vâgerâ stem of vâgerâyidan, → diverge, + noun suffix -i.

divergence theorem
  فربین ِ واگرایی   
farbin-e vâgerâyi

Fr.: théorème de flux-divergence   

Same as → Gauss's theorem.

divergence; → theorem.

divergent
  واگرا   
vâgerâ (#)

Fr.: divergent   

Relating to or causing divergence. Gowing away in different directions from a common point or path.
Math.: Failing to approach a limit.

M.L. divergent-, stem of divergens pr.p. of divergere, from → di- "apart," variant of → dis- + vergere "to bend, turn, incline," from PIE *werg- "to turn," from base *wer- "to turn, bend" (cf. L. vertere "to turn," Av. var ət- "to turn," Mod.Pers. gard, gardidan "to turn," Skt. vartate "turns round, rolls," Gk. rhatane "stirrer, ladle," Ger. werden, O.E. weorðan "to become."

Vâgerâ, agent noun from vâgerâyidan, → diverge + noun suffix -i.

divergent lens
  عدسی ِ واگرا   
adasi-ye vâgerâ (#)

Fr.: lentille divergente   

A lens which causes a parallel beam of light passing through it to diverge or spread out; concave lens. Same as diverging lens and → negative lens.

divergent; → lens.

diverse
  گوناگون   
gunâgun (#)

Fr.: diversité   

1) Differing from one another.
2) Composed of various kinds or forms; multiform.

M.E., from L. diversus, p.p. of divertere "to divert," from → di- + vert, from vertere "to turn," → convert.

Gunâgun, literally "of different kinds, sorts, species," from gun "kind, species, sort."

diversity
  گوناگونی   
gunâguni (#)

Fr.: diversité   

The state or fact of being diverse; difference; unlikeness.

diverse; → -ity.

dividend
  بخشی   
baxši (#)

Fr.: dividende   

A number which is to be divided by another number (→ divisor). Example: 36 in the expression 36 : 9 = 4.

From L. dividendum "thing to be divided," → division.

Bâxši, from bâxš, → division.

division
  ۱) بخش؛ ۲) شکاف   
1) baxš; 2) šekâf

Fr.: division   

1) The act or process of dividing; state of being divided.
Math.: An operation in which a dividend is divided by a divisor to give a quotient and a remainder.
2) Something that marks a division; a separation.

From O.Fr. division, from L. divisionem (nom. divisio), from divid-, stem of dividere "to cleave, distribute," from → dis- "apart" + -videre "to separate," from PIE base *widh- "to separate."

1) Baxš "portion, part, division," baxšidan "to divide, distribute, grant;" Mod./Mid.Pers. baxt "fortune, fate," baxtan, baxšidan "to distribute, divide," bâq "garden," initially "piece or patch of land," baq "god, lord;" Av. bag- "to attribute, allot, distribute," baxš- "to apportion, divide, give to," baxta- "what is allotted (luck, fortune)," baxədra- "part, portion," baγa- "master, god;" O.Pers. bāji- "tribute, tax;" cf. Skt. bhaj- "to share, divide, distribute, apportion," bhájati "divides," bhakta- "allotted; occupied with; a share; food or a meal, time of eating?" pitu-bháj- "enjoying food;" Gk. phagein"to eat (to have a share of food)"; PIE base *bhag- "to share out, apportion."
2) Šekâf "a fissure, crack, slit," šekâftan "to divide into two long strips, split, break," Mid.Pers. škâftan.

division sign
  نشانه‌ی ِ بخش   
nešâne-ye baxš

Fr.: signe de division   

A symbol placed between two quantities (dividend and the divisor) to indicate the division of the first by the second. The division sign is written as a horizontal line with dot above and dot below, ÷ (→ obelus), or a slash or horizontal line.

division; → sign.

divisor
  بخشیاب   
baxšyâb (#)

Fr.: diviseur   

A number by which another number, the → dividend, is divided.

division; → -or.

Baxšyâb, literally "division finder, ~ obtainer," from baxš, → division, + yâb, → finder.

DO white dwarf
  سفید‌کوتوله‌ی ِ DO   
sefid kutule-ye DO

Fr.: naine blanche DO   

A → white dwarf whose spectrum shows strong lines of singly ionized helium He II; He I or H may be present. As a DO star cools, the He II will recombine with free electrons to form He I, eventually changing the DO type into a DB white dwarf.

D short for → dwarf; O a convention; → white.

document
  ۱) دپه؛ ۲) دپیدن   
1) dapé; 2) dapidan

Fr.: 1) document; 2) (se) documenter   

1) A written or printed paper furnishing information or evidence, as a passport, deed, bill of sale, or bill of lading; a legal or official paper.
2) To furnish with documents. To furnish with references, citations, etc., in support of statements made (Dictionary.com).

M.E., from O.Fr. document "written evidence," from L. documentum "example, proof, lesson," in M.L. "official written instrument," from docere "to show, teach," cognate with Av. daē- "to show," Pers. andišidan, → think.

Dapé, from Mid.Pers. dib, dip "document;" O.Pers. dipī- "inscription;" related to dabir, → secretary; dapidan, infinitive from dap, dapé.

documentary
  دپگی، دپگین   
dapegi, dapegin

Fr.: documentaire   

1) Pertaining to, consisting of, or derived from documents.
2) Movies, Television: Based on or re-creating an actual event, era, life story, etc., that purports to be factually accurate and contains no fictional elements (Dictionary.com).

document; → -ary.

documentation
  دپش   
dapeš

Fr.: documentation   

1) The use of documentary evidence.
2) A furnishing with documents, as to substantiate a claim or the data in a book or article.
3) Computers: Manuals, listings, diagrams, and other hard- or soft-copy written and graphic materials that describe the use, operation, maintenance, or design of software or hardware (Dictionary.com).

document; → -tion.

dogma
  کیش   
kiš (#)

Fr.: dogma   

1) A specific tenet or doctrine authoritatively laid down, as by a church.
2) An official system of principles or tenets concerning faith, morals, behavior, etc., as of a church.
3) Prescribed doctrine proclaimed as unquestionably true by a particular group (Dictionary.com).

L. dogma "philosophical tenet," from Gk. dogma "opinion, tenet," literally "that which one thinks is true," from dokein "to seem good, think," cognate with Pers. andišé "thought," dis, → form.

Kiš "dogma, religion," from Mid.Pers. kêš "religion, faith, dogma;" Av. tkaēša- "teaching," kaeš-, kaš- "to teach;" PIE *kweis- "to observe, see" (Cheung 2007).

dogmatic
  کیشناک، کیشمند، کیشور   
kišnâk, kišmand, kišvar

Fr.: dogmatique   

1) Of, pertaining to, or of the nature of a dogma or dogmas; doctrinal.
2) Asserting opinions in a doctrinaire or arrogant manner; opinionated (Dictionary.com).

dogma + -t- + → -ic.

domain
  دمن   
daman

Fr.: domaine   

1) Math.: The set of x values that can go into a function f(x). Compare with → codomain and → range.
2) Ferromagnetism: Any of several microscopic regions polarized in various directions whose combination forms a ferroelectric substance. In the absence of an external magnetic field, the directions of the magnetization vectors of the separates domains do not coincide and the resultant magnetization of the whole body may be zero.

From M.Fr. domaine "domain, estate," from O.Fr. demaine "lord's estate," from L. dominium "property, dominion," from dominus "master of a household," from domus "house;" cognate with Pers. dam, as below; Gk. domos "house;" O.C.S. domu , Russ. dom "house;" Lith. dimstis "enclosed court, property;" O.E. timber "building, structure"); PIE base *dem-/*dom- "to build."

Daman, from Av. dəmāna- "house," dami "in the house;" cf. Sogd. δmān "house;" Mod.Pers. dam "wealth, means of comfort" (often as dam o dastgâh); "threshold, doorway;" Gilaki dâmana "ceiling;" Sariqoli waδem, Yazghulami wəδem "ceiling;" Skt. dám- "house;" Proto-Iranian *damH- "to build;" Gk. demo "I build;" L. domus "house," as above.

domain wall
  دیوار ِ دمن   
divâr-e daman

Fr.: paroi de domaine, mur ~ ~   

In a → ferroelectric substance, the transition layer between two → domains magnetized in different directions. It is of finite thickness ans has nonuniform → magnetization.

domain; → wall.

dome
  گنبد   
gonbad (#)

Fr.: coupole   

A vault, having a circular plan and usually in the form of a portion of a sphere, that shelters an optical telescope.
Geology: Rounded volcanic structure produced by eruption or intrusion of viscous high-silica magma. An uplift that is round or elliptical in map view with beds dipping away in all directions from a central point.

From Fr. dôme, from Gk. doma "house, housetop," related to domos "house" (PIE *domo-/*domu- "house, household;" cf. Av. dam-, dəmāna- "house," Skt. dám- "house," Gk. doma "house," L. domus "house," Rus. dom "house," Lith. dimstis "enclosed court, property," O.E. timber "building, structure").

Mid.Pers. gumbat, gônbat.

dome hatch
  دریچه‌ی ِ گنبد   
darice-ye gonbad

Fr.: volet de coupole   

One of small covers that can be moved along the dome slit to vary the slit size.

dome; → hatch.

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