PYRALID
Pyr"a*lid, n. Etym: [L. pyralis, -idis, a kind of winged insect.]
(Zoöl.)
Defn: Any moth of the family Pyralidæ. The species are numerous and mostly small, but some of them are very injurious, as the bee moth, meal moth, hop moth, and clover moth.
PYRAMID
Pyr"a*mid, n. Etym: [L. pyramis, -idis, fr. Gr. pyramide.]
1. A solid body standing on a triangular, square, or polygonal base, and terminating in a point at the top; especially, a structure or edifice of this shape.
2. (Geom.)
Defn: A solid figure contained by a plane rectilineal figure as base and several triangles which have a common vertex and whose bases are sides of the base.
3. pl. (Billiards)
Defn: The game of pool in which the balls are placed in the form of a triangle at spot. [Eng.] Altitude of a pyramid (Geom.), the perpendicular distance from the vertex to the plane of the base. — Axis of a pyramid (Geom.), a straight line drawn from the vertex to the center of the base. — Earth pyramid. (Geol.) See Earth pillars, under Earth. — Right pyramid (Geom.) a pyramid whose axis is perpendicular to the base.
PYRAMIDAL
Py*ram`i*dal, a. Etym: [Cf. F. pyramidal.]
1. Of or pertaining to a pyramid; in the form of a a pyramid; pyramidical; as, pyramidal cleavage. The mystic obelisks stand up Triangular, pyramidal. Mrs. Browning.