# 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: 25 Search : axis
 axis   آسه   âsé (#)Fr.: axe   1) One of the principal lines through the center of a figure or a solid, especially, the line which divides the figure or solid symmetrically. 2) A fixed line along which distances are measured or to which position are referred.L. axis "axle, pivot," akin to O.E. eax "axis, axle," Gk. axon "axle," Skt. aksa- "axle, axis, beam of a balance;" PIE base *aks- "axis."Âsé, from Pers. dialects: Qâyeni asak "the shaft connecting the plough to the yoke," Lori esi "a pillar (used to put up a tribal tent)," variants hosi, hosin, Tabari âssen "the foot of a door on which it turns," cf. Skt. īṣā- "pole or shafts of a carriage or plough," Av. aêša "the two shafts," Mod.Pers. xiš "plough(share)," Gk. oiax "handle of rudder, tiller, helm," PIE base *ei-, *oi- "pole, thill." axis of rotation   آسه‌ی ِ چرخش   âse-ye carxešFr.: axe de rotation   Same as → rotation axis and → rotational axis.→ axis; → rotation. axisymmetric   همامون ِ آسه‌ای، آسه-همامون   hamâmun-e âse-yi, âse-hamâmunFr.: axisymétrique   Having → axisymmetry. axisymmetry   همامونی ِ آسه‌ای، آسه-همامونی   hamâmuni-ye âse-yi, âse-hamâmuniFr.: axisymétrie   Same as → axial symmetry. celestial axis   آسه‌ی ِ آسمانی   âse-ye âsmân (#)Fr.: axe du monde   The Earth's axis extended to the → celestial pole.→ celestial; → axis. conjugate axis   آسه‌ی ِ همیوغ   âse-ye hamyuqFr.: axe conjugué   One of the two diameters of a conic, so related that a tangent at the end of one is parallel to the other.→ conjugate; → axis. declination axis   آسه‌ی ِ واکیلش   âse-ye vâkilešFr.: axe de déclinaison   The axis to which the telescope tube is fastened in an → equatorial mounting.→ declination; → axis. inclination of axis   درکیل ِ آسه   darkil-e âseFr.: inclinaison de l'axe   The angle between the rotation axis of a planet and the normal to the ecliptic.→ inclination; → axis. magnetic axis   آسه‌ی ِ مغناتیسی   âse-ye meqnâtisiFr.: axe magnétique   The imaginary straight line joining the two → poles of a → magnet.→ magnetic; → meridian. major axis   آسه‌ی ِ مهین   âse-ye mehinFr.: grand axe   The greatest diameter of an ellipse; it passes through the two foci.→ major; → axis. minor axis   آسه‌ی ِ کهین   âse-ye kehinFr.: petit axe   The axis of an ellipse that is perpendicular to the major axis at a point equidistant from the foci.→ minor; → axis. non-principal axis (NPA) rotational motion   جنبش ِ چرخشی به گرد ِ آسه‌ی ِ نا-فرین   jonbeš-e carxeši be gerd-e âse-ye nâ-farinFr.: mouvement rotationnel autour de l'axe non-parincipal   A → tumbling motion of an → asteroid. See also → tumbling asteroid.→ non-; → principal axis; → rotational; → motion. off-axis optical system   راژمان ِ نوریک ِ اپ-آسه   râžmân-e nurik-e ap-âséFr.: système optique hors axe   An → optical system in which the → optical axis of the → aperture is not coincident with the mechanical center of the aperture.→ off; → axis; → optical; → system. optic axis   آسه‌یِ نوری   âse-ye nuriFr.: axe optique   The direction in a doubly refracting crystal in which light is propagated without double refraction.→ optic; → axis. optical axis   آسه‌یِ نوری   âse-ye nuri (#)Fr.: axe optique   Line passing through the optical center and the center of curvature of a → spherical mirror or → lens. Same as → principal axis.→ optical; → axis. orbital axis   آسه‌ی ِ مداری   âse-ye madâriFr.: axe orbital   The → perpendicular to the → orbital plane.→ orbital; → axis. 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. perpendicular axis theorem   فربین ِ آسه‌ها‌ی ِ پالار   farbin-e âsehâ-ye pâlârFr.: théorème des axes perpendiculaires   The → moment of inertia of a plane object (→ lamina) about an axis perpendicular to the plane is equal to the sum of the moments of inertia about any two perpendicular axes in the plane. Thus if x and y axes are in the plane, Iz = Ix + Iy.→ perpendicular; → axis; → theorem. polar axis   آسه‌ی ِ قطبی   âse-ye qotbi (#)Fr.: axe polaire   The axis of an → equatorial mounting that is parallel to the Earth's axis, and consequently points to the celestial pole.→ polar; → axis. praxis   ورزیدار   varzidârFr.: praxis   1) The practice and practical side of knowledge or skills, as opposed to the → theory. 2) Accepted practice or custom.M.L. praxis "practice, action," from Gk. praxis "practice, action, doing," from stem of prassein "to do, to act."Varzidâr, from varzid past stem of varzidan, → practice, + -âr prefix forming nouns of action, such as kerdâr, raftâr, didâr, goftâr, jostâr, etc.

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