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

## فرهنگ ریشه شناختی اخترشناسی-اخترفیزیک

### M. Heydari-Malayeri    -    Paris Observatory

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Number of Results: 408
 orthogonal   ارداکنج   ardâkonjFr.: orthogonal   In elementary geometry, pertaining to or involving right angles or perpendiculars. Of a system of real functions, defined so that the integral of the product of any two different functions is zero. Of a linear transformation, defined so that the length of a vector under the transformation equals the length of the original vector. Of a square matrix, defined so that its product with its transpose results in the identity matrix.→ ortho- + gonia "angle," related to gony "knee;" L. genu "knee;" Mod.Pers. zânu "knee;" Av. žnav-, žnu- "knee;" Skt. janu-; PIE base *g(e)neu-, see below, + → -alArdâkonj, from ardâ-, → ortho-, + konj "angle, corner, confined place" (variants xong "corner, angle," Tabari kânj, Kurd. kunj, Hamadâni kom), maybe from the PIE base *g(e)neu-, as above, and related to Mod.Pers. zânu "knee" (Av. žnu-), Skt. kona- "angle, corner," Gk. gony, gonia, L. cuneus "a wedge," Albanian (Gheg dialect) kân "angle, corner," Albanian (Toks) kënd "angle, corner." orthogonal functions   کریاهایِ ارداکنج   karyâhâ-ye ardâkonjFr.: fonctions orthogonales   A set of functions, any two of which, by analogy to orthogonal vectors, vanish if their product is summed by integration over a specified interval.→ orthogonal; → function. orthogonal lines   خط‌هایِ ارداکنج   xatthâ-ye ardâkonjFr.: droites orthogonales   Perpendicular lines.→ orthogonal; → line. orthogonal trajectory   ترایشانه‌ی ِ ارداکنج   tarâyešâne-ye ardâkonjFr.: trajectoire orthogonale   Math.: An → isogonal trajectory where the family of curves are cut at right angles.→ orthogonal; → trajectory. orthogonal vectors   بردارهای ِ ارداکنج   bordârhâ-ye ardâkonjFr.: vecteurs orthogonaux   Two non-zero vectors which are perpendicular, i.e. their → scalar product is zero.→ orthogonal; → vector. orthogonality   ارداکنجی   ardâkonjiFr.: orthogonalité   1) The property of → orthogonal functions. 2) The following conditions satisfied by the → Fourier series: ∫ cos (mx) sin (nx) dx = 0 (summed from -π to +π) for all m, n∫ cos (mx) cos (nx) dx = 0 (summed from -π to +π) for all m ≠ n, = 2π for m = n = 0, = π for (m = n) > 0 ∫ sin (mx) sin (nx) dx = 0 (summed from -π to +π) for m ≠ n, = π for (m = n) > 0.→ orthogonal; → -ity. orthohydrogen   اردا-هیدروژن   ardâ-hidroženFr.: orthohydrogène   Molecular hydrogen in which the nuclei (protons) of the two hydrogen atoms contained in the molecule have spins in the same direction. → parahydrogen→ ortho-; → hydrogen. orthonormal vectors   بردارهای ِ ارداهنجارور   bordârhâ-ye ardâhanjârvarFr.: vecteurs orthonormaux   Two non-zero vectors that are → orthogonal and have magnitude 1.→ orthogonal; → vector. orthorhombic   اردالوزیک   ardâlowzikFr.: orthorhombique   Of or relating to a crystalline structure characterized by three mutually perpendicular axes of different length. → orthorhombic crystal system.→ ortho-; → rhombic. orthorhombic crystal system   راژمان ِ بلوری ِ اردالوزیک   râžmân-e boluri-ye ardâlowzikFr.: système cristallin orthorhombique   A → crystal system that has three mutually perpendicular axes, each of which is of a different length than the others.→ orthorhombic; → crystal; → system. orthoscopic   اردابینی   ardâbiniFr.: orthoscopique   Of or relating to an optical system corrected for → distortion.→ ortho-; → -scopic. orthoscopic eyepiece   چشمیِ اردابینی   cešmi-ye ardâbiniFr.: oculaire orthoscopique   A telescopic eyepiece that produces a wide field of view (between 40° and 50°). The eyepiece consists of a single element lens that is normally plano-convex, and a cemented triplet that is usually symmetrical.→ orthoscopic; → eyepiece. oscillate   نویدن   navidan (#)Fr.: osciller   To have, produce, or generate oscillations. → vibrate.From L. oscillatus, p.p. of oscillare "to swing," from oscill(um) "swing" + -ate a suffix forming verbs from L. words.Navidan "to swing, oscillate," from nâvidan, literally "to swing like a ship," from nâv "ship;" O.Pers./Av. *nāv-, O.Pers. nāviyā- "fleet;" Skt. nau-, nava- "ship, boat;" Gk. naus "ship;" PIE *nau- "boat." oscillating Universe   گیتیِ نونده   giti-ye navandéFr.: Univers oscillatoire   A cosmological model in which the Universe is closed and undergoes a series of oscillations, each beginning with a big bang and ending with a big crunch.Oscillating, verbal adj. of → oscillate; → universe. oscillation   نَوِش   naveš (#)Fr.: oscillation   The state of any quantity when the value of that quantity is continually changing so that it passes through maximum and minimum values.Verbal noun of → oscillate. oscillation mode   ترز ِ نَوِش، مُد ِ ~   tarz-e naveš, mod-e ~Fr.: modes d'oscillation   Same as → pulsation mode.→ oscillation; → mode. oscillator   نَوشگر   navešgar (#)Fr.: oscillator   A device for producing sonic or ultrasonic pressure waves in a medium. A device with no rotating parts for converting direct current into alternating current.Agent noun of → oscillate. oscillator strength   زورِ نوشگر   zur-e navešgarFr.: force d'oscillateur   A quantum-mechanical measure of the probability that a specific atomic transition will occur. It is used in the equation for the absorption coefficient of a spectral line. Also known as f value.→ oscillator; → strength. osculate   آبوسیدن   âbusidanFr.:   Geometry: Of a curve, to touch another curve so as to have the same tangent and curvature at the point of contact.From L. osculatum p.p. of osculari "to kiss," from osculum "kiss," literally "little mouth," diminutive of os "mouth;" PIE *os-/*ous- "mouth;" cf. Av. āh- "mouth;" Skt. ās-, āsán- "mouth;" Hittite aiš- "mouth;" O.Ir. á "mouth;" O.N. oss "mouth."Âbusidan, from â- a nuance prefix + busidan "to kiss," related to buyidan "to smell," buy "smell, scent;" Mid.Pers. bôy, bôd "smell, scent; consciousness," bôyidan "to smell," Mod./Mid.Pers. bustân "garden," Parthian (prefixed *pati-) pdbws- "to desire; to hope for;" Av. baod- "to perceive, notice, become aware of; to smell of," baoδi- "smell, fragrance," baozdri- "who gets to know sexually;" cf. Skt. bodh- "to wake, awaken; to perceive, pay attention," Buddha "awakened, enlightened;" Gk. peuthomai "to learn, hear;" Lith. budeti "to wake;" O.C.S. bljusti "to take care;" PIE base *bheudh- "to be aware, to make aware." osculating   آبوسنده   âbusandéFr.: osculateur   Relating to → osculate.Participial adjective of → osculate.