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ive phosphate of lime, occurring usually in six-sided prisms, color often pale green, transparent or translucent.

An opening; an open space; a gap, cleft, or chasm; a passage perforated; a hole; as, an aperture in a wall. An aperture between the mountains. Gilpin. The back aperture of the nostrils. Owen.

Pertaining to, or characterized by, apostasy; faithless to moral allegiance; renegade. So spake the apostate angel. Milton. A wretched and apostate state. Steele.

The act of becoming visible; appearance; visibility. Milton. The sudden apparition of the Spaniards. Prescott. The apparition of Lawyer Clippurse occasioned much speculation in that portion of the world. Sir W. Scott.

Naked spaces between the feathered areas of birds. See Pteryliæ.

A transparent, pale green variety of beryl, used as a gem. See Beryl.

A design or painting in thin transparent water colors; also, the mode of painting in such colors.

A painter in thin transparent water colors.

A kind of etching in which spaces are bitten by the use of aqua fortis, by which an effect is produced resembling a drawing in water colors or India ink; also, the engraving produced by this method.

ater. -- Aqueous humor (Anat.), one the humors of the eye; a limpid fluid, occupying the space between the crystalline lens and the cornea. (See Eye.) -- Aqueous rocks (Geol.), those which are deposited from water and lie in strata, as opposed to volcanic rocks, which are of igneous origin; -- called also sedimentary…

Of or pertaining to Aragon, in Spain, or to its inhabitants. -- n. sing. & pl.

A series of arches with the columns or piers which support them, the spandrels above, and other necessary appurtenances; sometimes open, serving as an entrance or to give light; sometimes closed at the back (as in the cut) and forming a decorative feature.

rface, as of the floor of a room or church, or of the ground within an inclosure; an open space in a building. The Alban lake . . . looks like the area of some vast amphitheater. Addison.

Of or pertaining to an area; as, areal interstices (the areas or spaces inclosed by the reticulate vessels of leaves).

An interstice or small space, as between the cracks of the surface in certain crustaceous lichens; or as between the fibers composing organs or vessels that interlace; or as between the nervures of an insect's wing.

form of fibrous connective tissue in which the fibers are loosely arranged with numerous spaces, or areolæ, between them.

Divided into small spaces or areolations, as the wings of insects, the leaves of plants, or the receptacle of compound flowers.

Any small space, bounded by some part different in color or structure, as the spaces bounded by the nervures of the wings of insects, or those by the veins of leaves; an areola.

A small inclosed area; esp. one of the small spaces on the wings of insects, circumscribed by the veins.

A exterior covering, forming a false coat or appendage to a seed, as the loose, transparent bag inclosing the seed or the white water lily. The mace of the nutmeg is also an aril. Gray.