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One of the curved ends of a crescent; esp., an extremity or cusp of the moon when crescent-shaped. The moon Wears a wan circle round her blunted horns. Thomson.

(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 is exceedingly poisonous to the touch for most pers…

A small opening in window tracery, of which the cusps, etc., make the form nearly square.

surface) (Geom.), the line along which a surface turns back upon itself; -- called also a cuspidal edge. -- Regression point (Geom.), a cusp.

curve possesses some peculiar properties not possessed by other points of the curve, as a cusp point, or a multiple point. -- Singular proposition (Logic), a proposition having as its subject a singular term, or a common term limited to an individual by means of a singular sign. Whately. -- Singular succession (Civil…

Any of several Australian grasses of the genus Tricuspis, which often form dense, almost impassable growth, their leaves being stiff and sharp-pointed.

A spitbox; a cuspidor.

Having three acute or setigerous points; tricuspidate.

Having or designating teeth with three cusps or tubercles; tricuspid.

ingulum was developed, and the three cones became arranged in a triangle, the two smaller cusps having moved to the outer side in upper and to the inner in lower molars. This primitive triangle is called the trigon or trigonid and this stage the tritubercular or trigonodont. The trigon being a cutting apparatus, an ext…