# An Etymological Dictionary of Astronomy and AstrophysicsEnglish-French-Persian

## فرهنگ ریشه شناختی اخترشناسی-اخترفیزیک

### M. Heydari-Malayeri    -    Paris Observatory

Homepage

Number of Results: 394
 orbital velocity   تندایِ مداری   tondâ-ye madâriFr.: vitesse orbitale   The velocity of an object in a given orbit around a gravitating mass. For a perfect circular orbit, the velocity is described by the formula V =√[G(M + m)/r], where G is the gravitational constant, M the mass of the primary gravitating body, m the mass of the orbiting object, and r the radius of the orbit.→ orbital; → velocity. orbitography   مدارنگاری   madârnegâriFr.: orbitographie   In astronautics, the study of satellite orbits and precise determination of orbital elements which gives the exact position of the satellite.→ orbital + → -graphy. order   ۱) رایه؛ ۲) رایاندن   1) râyé; 2) râyândanFr.: 1) ordre; 2) ordonner   1a) General: The way in which several items are arranged, as an indication of their relative importance or size or when each will be dealt with. 1b) Optics: → order of interference. 1c) Math.: The number of rows or columns of a → square matrix or → determinant. 1d) Math.: The highest → derivative appearing in a given → differential equation. For example, d2y/dx2 + 2y (dy/dx) - 3 = 0 is a differential equation of order two. 2) To arrange, regulate, or dispose things in their proper places. See also: → disorder, → first-order differential equation, → first-order partial derivative, → first-order spectrum, → interference order, → order of a tensor, → order of interference, → order of magnitude.From O.Fr. ordre, from earlier ordene, from L. ordinem (nominative ordo) "row, rank, arrangement."Râyé, noun related to râyânidan "to regulate, set in order," from Mid.Pers. râyânīdan "to arrange, organize," from rây- (Mod.Pers. ârây-, ârâyeš, ârâyidan "to arrange, adorn"), ârây-, ârâstan "to arrange, adorn;" O.Pers. rād- "to prepare," rās- "to be right, straight, true," rāsta- "straight, true" (Mod.Pers. râst "straight, true"); Av. rāz- "to direct, put in line, set," razan- "order;" Gk. oregein "to stretch out;" L. regere "to lead straight, guide, rule," p.p. rectus "right, straight;" Skt. rji- "to make straight or right, arrange, decorate;" PIE base *reg- "move in a straight line;" see also → direct. order of a graph   رایه‌ی ِ نگاره   râye-ye negâréFr.: ordre de graphe   The → number of → vertices.→ order; → graph. order of a tensor   رایه‌ی ِ تانسور   râye-ye tânsorFr.: ordre de tenseur   The maximum number of the indices (→ index) of a tensor.→ order; → tensor. order of interference   رایه‌یِ اندرزنش   râye-ye andarzanešFr.: ordre d'interfrérence   A whole number which characterizes a particular position of an interference fringe according to whether there is interference arising from one, two, three, etc. wavelength difference of path. Same as → interference order→ order; → interference. order of magnitude   رایه‌یِ بُرز   râye-ye borzFr.: ordre de grandeur   Value of a number or of a physical quantity given roughly, usually expressed as a power of 10. Thus, 2.5 x 105 and 6.4 x 105 are of the same order of magnitude, and 2 x 107 is 2 orders of magnitude greater than either.→ order; → magnitude. ordered   بارایه، رایه‌دار   bârâyé, râyedârFr.: ordonné   Characterized by → order; arranged according to a rule. → ordered tree.→ order + -ed. ordered tree   درخت ِ بارایه   deraxt-e bârâyéFr.: arbre ordonné   In → graph theory, a → tree in which the → children of each → vertex are ordered.→ ordered; → tree. ordinal   رایه‌ای   râye-yiFr.: ordinal   1) Of or relating to an order, as of animals or plants. 2) Of or relating to order, rank, or position in a series. 3) → ordinal number.M.E., from O.Fr., from L.L. ordinalis "denoting order or place in a series," from L. ordo (genitive ordinis) "row, series," → order; → -al.→ order; → -al. ordinal number   عدد ِ رایه‌یی   adad-e râye-yiFr.: nombre ordinal   1) A number which defines the position or rank of something in a series, in contrast to → cardinal number. For example, first, second, tenth, etc. 2) In → set theory, the order type of a → well-ordered set. Also called ordinal.→ ordinal; → number. ordinary   شونیک   šunikFr.: ordinaire   Usual; normal. → ordinary ray; → ordinary year.M.E. ordinarie, from O.Fr. ordinarie, from L. ordinarius "regular, usual, orderly," from ordo (genitive ordinis) "order" + -arius-ary.Šunik "ordinary," from Mid.Pers. šônik, šônig "ordinary, customary," from šôn "kind, manner, sort, way" + -ik, → -ic. ordinary differential equation   هموگش ِ دگرسانه‌ای شونیک   hamugeš-e degarsâneyi-ye šunikFr.: équation différentielle ordinaire   A → differential equation in which the unknown function depends on only one → independent variable, as contrasted with a → partial differential equation.→ ordinary; → differential; → equation. ordinary point   نقطه‌ی ِ شونیک   noqte-ye šunikFr.: point ordinaire   The point M0(x0,y0) of the curve F(x,y) = 0, where at least one of the partial derivatives ∂F/∂x and ∂F/∂y does not vanish. → singular point→ ordinary; → point. ordinary ray   پرتوِ شونیک   partov-e šunikFr.: rayon ordinaire   The ray that has an → isotropic speed in a → doubly refracting crystal. It obeys → Snell's law upon refraction at the crystal surface. See also → extraordinary ray→ ordinary; → ray. ordinary year   سال ِ شونیک   sâl-e šunikFr.: année ordinaire   A → calendar year that contains 365 days and therefore is not a → leap year.→ ordinary; → year. ordinate   آرا   ârâ (#)Fr.: ordonnée   Math.: In plane Cartesian coordinates, the distance of a point from the x-axis measured parallel to the y-axis. → abscissa.Ordinate, from N.L. (linea) ordinate (applicata) "(line applied) in order;" from ordinatus "arranged."Ârâ, from ârâstan "to arrange, to set in order, adorn," Mid.Pers. ârây-, ârâstan "to arrange, adorn;" O.Pers. rās- "to be right, straight, true," rāsta- "straight, true" (Mod.Pers. râst "straight, true"), rād- "to prepare;" Av. rāz- "to direct, put in line, set," razan- "order;" Gk. oregein "to stretch out;" L. regere "to lead straight, guide, rule," p.p. rectus "right, straight;" Skt. rji- "to make straight or right, arrange, decorate;" PIE base *reg- "move in a straight line." ore   کانه   kâné (#)Fr.: minerai   A natural deposit containing a mineral of an element to be extracted.Ore, merger of M.E. ore, O.E. ora "ore, unworked metal" and M.E. or(e) "ore, metal," O.E. ar "brass, copper, bronze" (cf. O.N. eir "brass, copper;" Ger. ehern "brazen;" Erz "oar;" Goth. aiz "bronze;" O.H.G. ēr "ore"), from PIE *aus- "gold;" cf. Mod/Mid..Pers. âhan "iron;" Av. aiianhaēna- "made of metal," from aiiah- "metal;" Skt. áyas- "iron, metal;" L. aes "brass"Kâné, from kân "mine," from kandan "to dig" (Mid.Pers. kandan "to dig;" O.Pers. kan- "to dig," akaniya- "it was dug;" Av. kan- "to dig," uskən- "to dig out" (→ ex- for prefix us-); cf. Skt. khan- "to dig," khanati "he digs"). organ   ۱) اندام؛ ۲) ا ُرگ؛ ۳، ۴) ا ُرگان   1) andâm; 2 org; 3, 4) orgânFr.: 1, 3, 4) organe; 2) orgue   1) Biology: A structure consisting of tissues and performing some specific function in an organism, e.g. the heart, kidneys, liver, stomach. 2) A large musical keyboard instrument producing a wide range of musical effects using compressed air passed through pipes. 3) An organization or body acting on behalf of a larger institution. 4) A newspaper or magazine regarded as a means of communication, especially one communicating the views of a particular group such as a political party.O.E. organe, from O.Fr. orgene "musical instrument," from L. organa, pluriel of organum, from Gk. organon "implement, musical instrument, organ of the body," literally "that with which one works," from PIE *werg-ano-, from base *werg- "to do, to work" related to Gk. ergon "work" (cf. Av. varəz- "to work, do, perform, exercise;" Mod.Pers. varz-, varzidan "to labor, exercise, practise;" Arm. gorc "work;" Lith. verziu "tie, fasten, squeeze," vargas "need, distress;" Goth. waurkjan; O.E. wyrcan "work," wrecan "to drive, hunt, pursue").1) Andâm, from Mid.Pers. handam "member, limb;" Av. handāma- "limb;" from Proto-Iranian *ham-dāman-, from prefix ham-→ com- + *dāman- "created;" Av. dā- "to give, grant; to put; to create; to determine" (O.Pers./Av. dā- "to give, grant, yield," dadāiti "he gives;" Mod.Pers. dâdan "to give;" cf. Skt. dadáti "he gives;" Gk. tithenai "to place, put, set," didomi "I give;" L. dare "to give, offer," facere "to do, to make;" Rus. delat' "to do;" O.H.G. tuon, Ger. tun, O.E. don "to do;" PIE base *dhe- "to put, to do"); cf. Skt. sandháy- "joint, articulation." 2), 3), 4) loanwords from Fr., as above. organic   ۱) ارگانیک، آلی؛ ۲) سازماندار؛ ۳) ارگانیک   1) orgânik, âli; 2) sâzmândâr; 3) orgânikFr.: organique   1) Of, relating to, or derived from living organisms: organic matter. 2) Characterized by the systematic arrangement of parts; organized; systematic. 3) Chemistry: Of or designating carbon compounds.From L. organicus, from Gk. organikos "of or pertaining to an organ," from organon "instrument," → organ, + → -ic.1) Orgânik, loan from Fr.; âli loan from Ar.; 2) sâzmândâr, from sâzmân, → organization, + dâr "having, possessor" (from dâštan "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").