| plane of pelvic canal | A hypothetical curved line joining the centre point of each of the four planes of the pelvis, marking the centre of the pelvic cavity at every level. Synonym: axis pelvis, plane of pelvic canal. (05 Mar 2000) |
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| plane of regard | An imaginary plane through which the point of regard moves as the eyes are turned from side to side. (05 Mar 2000) |
| plane suture | A simple firm apposition of two smooth surfaces of bones, without overlap, as seen in the lacrimomaxillary suture. Synonym: sutura plana, harmonia, harmonic suture. (05 Mar 2000) |
| plane tree | <botany> Same as 1st Plane. Source: Websters Dictionary (01 Mar 1998) |
| plane wart | A smooth, flat, flesh-coloured wart of small size, occurring in groups, seen especially on the face of the young; often associated with common warts of the hands, due to human papilloma virus, commonly, types 3 and 10. Synonym: flat wart, plane wart, verruca plana juvenilis. (05 Mar 2000) |
| plane wave | <microscopy> Wave in which wavefronts are parallel to a plane normal to the direction of propagation. (05 Aug 1998) |
| plane, focal | <microscopy> A plane through the focal point perpendicular to the principle axis of a lens or mirror. (05 Aug 1998) |
| plane-parallel | <optics> Having opposite surfaces exactly plane and parallel, as a piece of glass. Source: Websters Dictionary (01 Mar 1998) |
| plane-polarized light | <chemistry> Light which is passed through a filter which blocks out all the light except that which ocillates in one plane. (09 Jan 1998) |
| planer | 1. One who, or that which, planes; a planing machine; especially, a machine for planing wood or metals. 2. A wooden block used for forcing down the type in a form, and making the surface even. Planer centers. See Center. Source: Websters Dictionary (01 Mar 1998) |
| planer tree | <botany> A small-leaved North American tree (Planera aquatica) related to the elm, but having a wingless, nutlike fruit. Origin: From J.S.Planer, a German botanist. Source: Websters Dictionary (01 Mar 1998) |
| planes of reference | Plane's which act as a guide to the location of other plane's. (05 Mar 2000) |
| planet | 1. <astronomy> A celestial body which revolves about the sun in an orbit of a moderate degree of eccentricity. It is distinguished from a comet by the absence of a coma, and by having a less eccentric orbit. See Solar system. The term planet was first used to distinguish those stars which have an apparent motion through the constellations from the fixed stars, which retain their relative places unchanged. The inferior planets are Mercury and Venus, which are nearer to the sun than is the earth; the superior planets are Mars, the asteroids, Jupiter, Saturn, Uranus, and Neptune, which are farther from the sun than is the earth. Primary planets are those which revolve about the sun; secondary planets, or moons, are those which revolve around the primary planets as satellites, and at the same time revolve with them about the sun. 2. A star, as influencing the fate of a men. "There's some ill planet reigns." (Shak) Planet gear. <machinery> See Epicyclic train, under Epicyclic. Planet wheel, a gear wheel which revolves around the wheel with which it meshes, in an epicyclic train. Origin: OE. Planete, F. Planete, L. Planeta, fr. Gr, and a planet; prop. Wandering, fr. To wander, fr. A wandering. Source: Websters Dictionary (01 Mar 1998) |
| planetary | 1. Of or pertaining to the planets; as, planetary inhabitants; planetary motions; planetary year. 2. Consisting of planets; as, a planetary system. 3. <astronomy> Under the dominion or influence of a planet. "Skilled in the planetary hours." 4. Caused by planets. "A planetary plague." 5. Having the nature of a planet; erratic; revolving; wandering. "Erratical and planetary life." Planetary days, the days of the week as shared among the planets known to the ancients, each having its day. Hutton. Planetary nebula, a nebula exhibiting a uniform disk, like that of a planet. Origin: Cf. L. Planetarius an astrologer, F. Planetaire planetary. See Planet. Source: Websters Dictionary (01 Mar 1998) |
| planetoid | <astronomy> A body resembling a planet; an asteroid. Origin: Planet. Source: Websters Dictionary (01 Mar 1998) |