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

## فرهنگ ریشه شناختی اخترشناسی-اخترفیزیک

### M. Heydari-Malayeri    -    Paris Observatory

Homepage

Number of Results: 9 Search : parallel
 antiparallel   پاد-پراسو   pâd-parâsuFr.: antiparallèle   A → pair of → vectors whose directions are parallel but having the opposite sense.→ anti-; → parallel. geodetic parallel   پراسوی ِ زمین‌سنجیک   parâsu-ye zamin-sanjikFr.: parallèle géodésique   Any of the small circles on the → reference ellipsoid parallel to the → geodetic equator.→ geodetic; → parallel. parallel   پراسو   parâsuFr.: parallèle   1) Said of two or more things, such as lines or planes, that are equally distant from one another at all points. 2) Electricity: An arrangement of the components in an electric circuit so that the same voltage is applied to each component. Compare → series. From M.Fr. parallèle, from L. parallelus, from Gk. parallelos "parallel," from para allelois "beside one another," from → para- "beside" + allelois "each other," from allos "other," → alias.Parâsu, from parâ-, → para-, + su "direction, side," from Mid.Pers. sÃ´k "direction, side." parallel axis theorem   فربین ِ آسه‌ها‌ی ِ پراسو   farbin-e âsehâ-ye parâsuFr.: théorème des axes parallèles   The → moment of inertia of a body about any given axis is the moment of inertia about a parallel axis through the center of mass, plus the moment of inertia about the given axis if the mass were located at the center of mass. same as → Steiner's theorem.→ parallel; → axis; → theorem. parallel of altitude   پرهون ِ فرازا   parhun-e farâzâFr.: almucantar   A small circle on the celestial sphere whose plane is parallel to the celestial horizon. Same as → almucantar.→ parallel; → altitude. parallelepiped   پراسورویه، لوزی‌وار   parâsuruyé, lowzivârFr.: parallélépipède   A solid figure whose six bases are → parallelograms, opposite pairs being identical and parallel.From Gk. parallelepipedon, from parallelos, → parallel + epipedon "plane surface," from neuter of epipedos "flat," from → epi- + pedon "ground," cognate with L. ped-, pes, → foot.Parâsuruyé, from parâsu, → parallel, + ruyé, → surface. Lowzivâr, from lowzi, → rhombus + -vâr, → -oid. parallelogram   پراسوبر   parâsubarFr.: parallélogramme   A four-sided → polygon whose opposite sides are parallel. A parallelogram all of whose angles are right angles is a → rectangle.From Fr. parallélogramme, from L. parallelogrammum, from Gk. parallelogrammon "bounded by parallel lines," from parallelos, → parallel, + gramme "line," related to graphein "to write, draw" → -graph.Parâsubar, from parâsu, → parallel, + bar, → side. plane-parallel atmosphere   هواسپهر ِ پراسو-تخت، جو ِ ~   havâsepehr-e parâsu-taxthâ, javv-e ~Fr.: atmosphère plan-parallèle   An approximation used in many stellar atmosphere models that depict the atmosphere as being only one-dimensional and bounded at the top and bottom by horizontal plane surfaces normal to the direction of gravity.→ plane; → parallel; → atmosphere. plane-parallel plate   تیغه‌ی ِ تخت-پراسو   tiqe-ye taxt-parâsuFr.: lame plan-parallèle   A piece of glass with plane parallel surfaces used to admit light into an optical system and to exclude dirt and moisture.→ plane; → parallel; → plate.