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Webster 1913 Edition

Pyramid

Pyr′a-mid

,
Noun.
[L.
pyramis
,
-idis
, fr. Gr. [GREEK], [GREEK], of Egyptian origin: cf. F.
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.)
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)
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.

Webster 1828 Edition

Pyramid

PYR'AMID

,
Noun.
[L. pyramis. The origin and composition of this word are not ascertained. It is supposed that the Gr. fire, forms one of its component parts.] A solid body standing on a triangular, square or polygonal base, and terminating in a point at the top; or in geometry, a solid figure consisting of several triangles,whose bases are all in the same plane,and which have one common vertex.
The pyramids of Egypt may have been erected to the sun, during the prevalence of Sabianism.
A pyramid is formed by the meeting of three or more planes at a point termed the apex.

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