Part 317

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.

Plane" ta`ble (?). See under Plane, a.

Plan`e*ta"ri*um (?), n. [NL.: cf. F. planÈtaire. See Planetary.] An orrery. See Orrery.

Plan"et*a*ry (?), a. [Cf. L. planetarius an astrologer, F. planÈtaire planetary. See Planet.] 1. Of or pertaining to the planets; as, planetary inhabitants; planetary motions; planetary year.

2. Consisting of planets; as, a planetary system.

3. (Astrol.) Under the dominion or influence of a planet. "Skilled in the planetary hours." Drayton.

4. Caused by planets. "A planetary plague." Shak.

5. Having the nature of a planet; erratic; revolving; wandering. "Erratical and planetary life." Fuller.

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.

Plan"et*ed, a. Belonging to planets. [R.] Young.

{ Pla*net"ic (?), Pla*net"ic*al (?), } a. [L. planeticus, Gr. &?;.] Of or pertaining to planets. Sir T. Browne.

Plan"et*oid (?), n. [Planet + -oid.] (Astron.) A body resembling a planet; an asteroid.

Plan"et*oid*al (?), a. Pertaining to a planetoid.

Plane" tree` (?). (Bot.) Same as 1st Plane.

{ Plan"et-strick`en (?), Plan"et-struck` (?), } a. Affected by the influence of planets; blasted. Milton.

Like planet-stricken men of yore He trembles, smitten to the core By strong compunction and remorse.

Wordsworth.

Plan"et*ule (?), n. A little planet. [R.] Conybeare.

Plan"gen*cy (?), n. The quality or state of being plangent; a beating sound. [R.]

Plan"gent (?), a. [L. plangens, -entis, fr. plangere to beat. See Plaint.] Beating; dashing, as a wave. [R.] "The plangent wave." H. Taylor.

{ Plan"i- (?), Plan"o- (?) }. [L. planus. See Plane, a.] Combining forms signifying flat, level, plane; as planifolious, planimetry, plano- concave.

Plan`i*fo"li*ous (?), a. [Plani- + L. folium leaf.] (Bot.) Flat-leaved.

Plan"i*form (?), a. (Anat.) Having a plane surface; as, a planiform, gliding, or arthrodial articulation.

Pla*nim"e*ter (?), n. [Plani- + -meter. Cf. Planometer.] An instrument for measuring the area of any plane figure, however irregular, by passing a tracer around the bounding line; a platometer.

{ Plan`i*met"ric (?; 277), Plan`i*met"ric*al (?), } a. [Cf. F. planimÈtrique.] Of or pertaining to planimetry.

Pla*nim"e*try (?), n. [Cf. F. planimÈtrie.] The mensuration of plane surfaces; -- distinguished from stereometry, or the mensuration of volumes.

Plan"ing (?), a. & vb. n. fr. Plane, v. t.

Planing machine. (a) See Planer. (b) A complex machine for planing wood, especially boards, containing usually a rapidly revolving cutter, which chips off the surface in small shavings as the piece to be planed is passed under it by feeding apparatus.