| 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) |
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| evolution, planetary | Creation and development of bodies within solar systems, includes study of early planetary geology. (12 Dec 1998) |
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