Plane angle, the angle included between two straight lines in a plane.Plane chart, Plane curve. See under Chart and Curve.Plane figure, a figure all points of which lie in the same plane. If bounded by straight lines it is a rectilinear plane figure, if by curved lines it is a curvilinear plane figure.Plane geometry, that part of geometry which treats of the relations and properties of plane figures.Plane problem, a problem which can be solved geometrically by the aid of the right line and circle only.Plane sailing(Naut.), the method of computing a ship's place and course on the supposition that the earth's surface is a plane.Plane scale(Naut.), a scale for the use of navigators, on which are graduated chords, sines, tangents, secants, rhumbs, geographical miles, etc.Plane surveying, surveying in which the curvature of the earth is disregarded; ordinary field and topographical surveying of tracts of moderate extent.Plane table, an instrument used for plotting the lines of a survey on paper in the field.Plane trigonometry, the branch of trigonometry in which its principles are applied to plane triangles.

Plane
(Plane), n. [F. plane, L. plana. See Plane, v. & a.]

1. (Geom.) A surface, real or imaginary, in which, if any two points are taken, the straight line which joins them lies wholly in that surface; or a surface, any section of which by a like surface is a straight line; a surface without curvature.

2. (Astron.) An ideal surface, conceived as coinciding with, or containing, some designated astronomical line, circle, or other curve; as, the plane of an orbit; the plane of the ecliptic, or of the equator.

1. A floor of wood; also, a plank. [Obs.] Bacon.

2. (Arch.) The under side of a cornice; a soffit.

Plancher
(Planch"er), v. t. To form of planks. [Obs.] Golding.

Planchet
(Planch"et) n. [F. planchette a small board, dim. of planche. See Planch.] A flat piece of metal; especially, a disk of metal ready to be stamped as a coin.

Planchette
(Plan`chette") n. [F. See Planchet.]

1. A circumferentor. See Circumferentor.

2. A small tablet of wood supported on casters and having a pencil attached. The characters produced by the pencil on paper, while the hand rests on the instrument and it is allowed to move, are sometimes translated as of oracular or supernatural import.

Planching
(Planch"ing) n. The laying of floors in a building; also, a floor of boards or planks.

Plane
(Plane) n. [F., fr. L. platanus, Gr. fr. broad; — so called on account of its broad leaves and spreading form. See Place, and cf. Platane, Plantain the tree.] (Bot.) Any tree of the genus Platanus.

The Oriental plane (Platanus orientalis) is a native of Asia. It rises with a straight, smooth, branching stem to a great height, with palmated leaves, and long pendulous peduncles, sustaining several heads of small close-sitting flowers. The seeds are downy, and collected into round, rough, hard balls. The Occidental plane which grows to a great height, is a native of North America, where it is popularly called sycamore, buttonwood, and buttonball, names also applied to the California species

Plane
(Plane) a. [L. planus: cf. F. plan. See Plan, a.] Without elevations or depressions; even; level; flat; lying in, or constituting, a plane; as, a plane surface.

In science, this word (instead of plain) is almost exclusively used to designate a flat or level surface.

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