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. [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 th…

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 corner. [Obs.] Lurking in hernes and in lanes blind. Chaucer.

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

bling 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.

Having all the planes required by complete symmetry, -- in opposition to hemihedral.

Presenting hemihedral forms, in which all the sectants have halt the whole number of planes. Dana.

od of constructing geographical charts or maps, so that the surfaces, as delineated on a plane, have the same relative size as the real surfaces; that is, so that the relative actual areas of the different countries are accurately represented by the corresponding portions of the map.

A plane passing through the eye of the spectator and at right angles to the vertical at a given place; a plane tangent to the earth's surface at that place; called distinctively the sensible horizon.

Measured or contained in a plane of the horizon; as, horizontal distance. Horizontal drill, a drilling machine having a horizontal drill spindle. -- Horizontal engine, one the piston of which works horizontally. -- Horizontal fire (Mil.), the fire of ordnance and small arms at point-blank range or at low angles of el…

y. -- Horse run (Civil Engin.), a device for drawing loaded wheelbarrows up an inclined plane by horse power. -- Horse sense, strong common sense. [Colloq. U.S.] -- Horse soldier, a cavalryman. -- Horse sponge (Zoöl.), a large, coarse, commercial sponge (Spongia equina). -- Horse stinger (Zoöl.), a large dragon fly…

15º, or one hour, each. (b) A circle upon an equatorial telescope lying parallel to the plane of the earth's equator, and graduated in hours and subdivisions of hours of right ascension. (c) A small brass circle attached to the north pole of an artificial globe, and divided into twenty-four parts or hours. It is used…

or house of life, downward, or in the direction of the earth's revolution, the stars and planets passing through them in the reverse order every twenty- four hours.