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The rate of ascent or descent; gradient; deviation from a level surface to an inclined plane; -- usually stated as so many feet per mile, or as one foot rise or fall in so many of horizontal distance; as, a heavy grade; a grade of twenty feet per mile, or of 1 in 264.

a whitish, grayish, or flesh-red color. It differs from gneiss in not having the mica in planes, and therefor in being destitute of a schistose structure.

Ground line (Descriptive Geom.), the line of intersection of the horizontal and vertical planes of projection. -- Ground liverwort (Bot.), a flowerless plant with a broad flat forking thallus and the fruit raised on peduncled and radiated receptacles (Marchantia polymorpha). -- Ground mail, in Scotland, the fee paid…

A thin quadrant, made of brass, wood, etc., showing a stereographic projection on the plane of the equator. By it are found the hour of the day, the sun's azimuth, the altitude of objects in degrees, etc. See Gunter's scale.

by crowning it with ornaments, regularly spaced, like a diminutive battlement. -- Gutter plane, a carpenter's plane with a rounded bottom for planing out gutters. -- Gutter snipe, a neglected boy running at large; a street Arab. [Slang] -- Gutter stick (Printing), one of the pieces of furniture which separate pages i…

Having the planes arranged spirally, so that they incline all to the right (or left) of a vertical line; -- said of certain hemihedral forms.

rotation of the earth, through the tendency of the rotating wheel to preserve a constant plane of rotation, independently of the earth's motion.

An instrument for drawing spiral lines on a plane.

A nonplane curve whose tangents are all equally inclined to a given plane. The common helix is the curve formed by the thread of the ordinary screw. It is distinguished from the spiral, all the convolutions of which are in the plane.

e. [Obs. or Prov. Eng.] Helm amidships, when the tiller, rudder, and keel are in the same plane. -- Helm aport, when the tiller is borne over to the port side of the ship. -- Helm astarboard, when the tiller is borne to the starboard side. -- Helm alee, Helm aweather, when the tiller is borne over to the lee or to t…

Having half of the similar parts of a crystals, instead of all; consisting of half the planes which full symmetry would require, as when a cube has planes only on half of its eight solid angles, or one plane out of a pair on each of its edges; or as in the case of a tetrahedron, which is hemihedral to an octahedron, it…

Presenting hemihedral forms, in which half the sectants have the full number of planes.

Having the two ends modified with unlike planes; -- said of a crystal.

To divide along the mesial plane.

A division along the mesial plane; also, one of the parts so divided.

A half sphere; one half of a sphere or globe, when divided by a plane passing through its center.

A plane figure of eleven sides and eleven angles. [Written also endecagon.]

A plane figure consisting of seven sides and having seven angles.

A plane figure of six angles. Regular hexagon, a hexagon in which the angles are all equal, and the sides are also all equal.

mbling a hinge, by which two pieces are connected so as to permit relative turning in one plane. -- To be off the hinges, to be in a state of disorder or irregularity; to have lost proper adjustment. Tillotson.