An Etymological Dictionary of Astronomy and Astrophysics

فرهنگ ریشه شناختی اخترشناسی-اخترفیزیک

M. Heydari-Malayeri    -    Paris Observatory



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Number of Results: 754
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.

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.

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."

gunâguni (#)

Fr.: diversité   

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

diverse; → -ity.

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.

  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.

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.

  ۱) وسین؛ ۲) وسینیدن   
1) vosin; 2) vosinidan

Fr.: 1) divore; 2) divorcer   

1a) The legal dissolution of a marriage by a court or other competent body.
1b) A legal decree dissolving a marriage.
2) Legally dissolve one's marriage with someone (

M.E., from O.Fr. divorce from L. divortium "separation, dissolution of marriage," from divertere "to turn in different directions, to separate," from di- blended with → de- "apart," + vertere "to turn," → version.

Vosin, from Sangesari vovsin "divorce," related to Mid.Pers. visastan "to break," Mod.Pers. gosastan, ultimately from Proto-Ir. (+ *ui-) *said- "to break, split;" cf. Av. (+ *aua-) auua.siδ- "to split;" Baluci sist/sid-, sind- "to break, split;" Skt. ched "to split, to cut off;" Gk. sizo "to cut through, to split;" L. scindo "I tear up."

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.

  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 (

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.

  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 (

document; → -ary.


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 (

document; → -tion.

davâzdahân (#)

Fr.: dodekatemorion   

A segment of the → zodiac extending 2.5 degrees, as considered in Babylonian and Hellenistic astrology; plural: dodekatemoria. Dodekatemoria result from a subdivision of each → zodiacal sign into twelve equal parts, each given the name of a → sign, beginning with the name of the sign being divided and continuing throughout the other eleven sequentially. Each zodiacal sign therefore contained a micro-zodiac within its own 30° span. Textual evidence for the micro-zodiac does not antedate the sixth century BC (F. Rochberg, 2010, In the Path of the Moon, BRILL).

From Gk. dodekatemorion "twelfth part," from dodeka "twelve."

Davâzdahân, from Mid.Pers. dwâzdahân "the twelve ones," from dwâzdah (Mod.Pers. davâzdah) "twelve;" Av. dvadasa, from dva "→ two" + dasa "→ ten."

sag (#)

Fr.: chien   

A domestic mammal related to the wolf and bred in many varieties.

From M.E. dogge, from O.E. docga "hound, powerful breed of dog," cognate with Scots dugdogge, Ger. Dogge, of unknown origin.

Sag "dog" (Lori say, sayu "puppy;" Pashto spay, spie "bitch;" Semnâni esba; Sangesari əsba; Kajali of Khlkhâl esbé; Tâleshi of Vizna səba; Abyâni kuyâ); from Mid.Pers. sag "dog;" O.Pers. *saka-; Median *spaka-; Av. spā-; cf. Skt. svâ-; L. canis "dog;" Gk. kuon; O.E. hund, E. hound, Ger. Hund; PIE *kwon-.

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 (

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).

  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 (

dogma + -t- + → -ic.


Fr.: dogmatisma   

The tendency to lay down principles as undeniably true, without consideration of evidence or the opinions of others (

dogmatic;→ -ism.

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