Planet gear
Planet Plan"et, n. [OE. planete, F. plan[`e]te, L. planeta, fr. Gr. ?, and ? a planet; prop. wandering, fr. ? to wander, fr. ? a wandering.] 1. (Astron.) 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}. [1913 Webster]

Note: 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. [1913 Webster]

2. A star, as influencing the fate of a men. [1913 Webster]

There's some ill planet reigns. --Shak. [1913 Webster]

{Planet gear}. (Mach.) See {Epicyclic train}, under {Epicyclic}.

{Planet wheel}, a gear wheel which revolves around the wheel with which it meshes, in an epicyclic train. [1913 Webster]


The Collaborative International Dictionary of English. 2000.

Look at other dictionaries:

  • planet gear — See planet gears stepped planet gear sun and planet gears …   Dictionary of automotive terms

  • planet gear — (also planet wheel) noun a gearwheel forming part of a sun and planet gear system …   English new terms dictionary

  • planet gear — noun an outer gear that revolves about a central sun gear of an epicyclic train • Syn: ↑planetary gear, ↑epicyclic gear, ↑planet wheel • Hypernyms: ↑gear, ↑gear wheel, ↑geared wheel, ↑cogwheel …   Useful english dictionary

  • planet gear — Mach. any of the gears in an epicyclic train surrounding and engaging with the sun gear. Also called planet wheel. [1915 20] * * * …   Universalium

  • Sun and planet gear — The sun and planet gear (also called the planet and sun gear) was a method of converting reciprocal motion to rotary motion and utilised a reciprocating steam engine.It was likely invented by the Scottish engineer William Murdoch, an employee of… …   Wikipedia

  • stepped planet gear — A planet gear with different diameters …   Dictionary of automotive terms

  • sun-and-planet gear — noun a system of gearwheels consisting of a central wheel (a sun gear or sun wheel) around which other wheels (planet gears or planet wheels) travel …   English new terms dictionary

  • sun-and-planet gear — /sun euhn plan it/, Mach. a planetary epicyclic gear train. [1900 05] * * * …   Universalium

  • sun-and-planet gear — /sun euhn plan it/, Mach. a planetary epicyclic gear train. [1900 05] …   Useful english dictionary

  • Planet — Plan et, n. [OE. planete, F. plan[ e]te, L. planeta, fr. Gr. ?, and ? a planet; prop. wandering, fr. ? to wander, fr. ? a wandering.] 1. (Astron.) A celestial body which revolves about the sun in an orbit of a moderate degree of eccentricity. It… …   The Collaborative International Dictionary of English

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