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orbital velocity tondâ-ye madâri Fr.: 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. |
orbitography madârnegâri Fr.: orbitographie In astronautics, the study of satellite orbits and precise determination of orbital elements which gives the exact position of the satellite. |
order 1) râyé; 2) râyândan Fr.: 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. 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 râye-ye negâré Fr.: ordre de graphe |
order of a tensor râye-ye tânsor Fr.: ordre de tenseur The maximum number of the indices (→ index) of a tensor. |
order of interference râye-ye andarzaneš Fr.: 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 râye-ye borz Fr.: 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 10^{5} and 6.4 x 10^{5} are of the same order of magnitude, and 2 x 10^{7} is 2 orders of magnitude greater than either. |
ordered bârâyé, râyedâr Fr.: ordonné Characterized by → order; arranged according to a rule. → ordered tree. → order + -ed. |
ordered tree deraxt-e bârâyé Fr.: arbre ordonné In → graph theory, a → tree in which the → children of each → vertex are ordered. |
ordinal râye-yi Fr.: ordinal 1) Of or relating to an order, as of animals or plants. 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. |
ordinal number adad-e râye-yi Fr.: 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. |
ordinary šunik Fr.: 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 hamugeš-e degarsâneyi-ye šunik Fr.: 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 noqte-ye šunik Fr.: point ordinaire The point M_{0}(x_{0},y_{0}) 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 ray partov-e šunik Fr.: 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 year sâl-e šunik Fr.: année ordinaire A → calendar year that contains 365 days and therefore is not a → leap year. |
ordinate 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 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 1) andâm; 2 org; 3, 4) orgân Fr.: 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. 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." |
organic 1) orgânik, âli; 2) sâzmândâr; 3) orgânik Fr.: organique 1) Of, relating to, or derived from living organisms: organic matter. 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"). |
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