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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.

neral of brownish black color, occurring in columnar or foliated masses. It is native manganese tungstate.

parent, siliceous fibres twisted together like the strands of a color. The stem of the Japanese species (H. Sieboldii), called glass-rope, has long been in use as an ornament. See Glass-rope.

valve for regulating the distribution of water in the cylinders of hydraulic elevators, cranes, etc. (b) (Gas Works) An inverted cup with a partition dipping into water, for opening or closing communication between two gas mains, the open ends of which protrude about the water.

A hydro-aëroplane having two supporting planes.

A plane, or any of a number of planes, projecting from the hull of a submarine boat, which by being elevated or depressed cause the boat, when going ahead, to sink or rise, after the manner of an aëroplane.

The production of artificial membranes by contact of two fluids, as albumin and fat, by which the globules of the latter are surrounded by a thin film of the former.

A surface of the second order, which is cut by certain planes in hyperbolas; also, the solid, bounded in part by such a surface. Hyperboloid of revolution, an hyperboloid described by an hyperbola revolving about one of its axes. The surface has two separate sheets when the axis of revolution is the transverse axis, bu…

s, hyposulphuric acid. Hyposulphuric acid, an acid, H2S2O6, obtained by the action of manganese dioxide on sulphur dioxide, and known only in a watery solution and in its salts; -- called also dithionic acid. See Dithionic.

ome extraneous substance formed on minerals. [R.] A thin crust or illinition of black manganese. Kirwan.

A Japanese measure of length equal to about two and one twelfth yards. [Written also ink.]

The angle made by two lines or planes; as, the inclination of the plane of the earth's equator to the plane of the ecliptic is about 23º 28'; the inclination of two rays of light.

plane, or of space, which is infinitely distant. In modern geometry, parallel lines or planes are sometimes treated as lines or planes meeting at infinity. Circle at infinity, an imaginary circle at infinity, through which, in geometry of three dimensions, every sphere is imagined to pass. -- Circular points at infin…

f receptacles of hard material, as lacquered wood, iron, bronze, or ivory, used by the Japanese to hold medicines, perfumes, and the like, and carried in the girdle. It is usually secured by a silk cord by which the wearer may grasp it, which cord passes through an ornamental button or knob called a netsuke.…

to, affecting, or addressing, the senses. That intermediate door Betwixt the different planes of sensuous form And form insensuous. Mrs. Browning.

Between the sternal; -- said of certain membranes or parts of insects and crustaceans.

in which the principal lines are parallel to three rectangular axes, and the principal planes are parallel to three rectangular planes passing through the three axes.

n. -- Ivy owl (Zoöl.), the barn owl. -- Ivy tod (Bot.), the ivy plant. Tennyson. -- Japanese ivy (Bot.), a climbing plant (Ampelopsis tricuspidata), closely related to the Virginia creeper. -- Poison ivy (Bot.), an American woody creeper (Rhus Toxicodendron), with trifoliate leaves, and greenish-white berries. It i…

Work varnished and figured in the Japanese manner; also, the varnish or lacquer used in japanning.