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Pyramidion :: Pyramidion (n.) The small pyramid which crowns or completes an obelisk.

Diamond :: Diamond (n.) A pointed projection, like a four-sided pyramid, used for ornament in lines or groups..

Dihexagonal :: Dihexagonal (a.) Consisting of two hexagonal parts united; thus, a dihexagonal pyramid is composed of two hexagonal pyramids placed base to base..

Pyramidal :: Pyramidal (a.) Same as Tetragonal.

Date :: Date (v. t.) To note or fix the time of, as of an event; to give the date of; as, to date the building of the pyramids..

Rosehead :: Rosehead (n.) A many-sided pyramidal head upon a nail; also a nail with such a head.

Pylon :: Pylon (n.) A low tower, having a truncated pyramidal form, and flanking an ancient Egyptian gateway..

Cuniform :: Cuniform (n.) One of the carpal bones usually articulating with the ulna; -- called also pyramidal and ulnare.

Taper :: Taper (a.) Regularly narrowed toward the point; becoming small toward one end; conical; pyramidical; as, taper fingers..

Frustum :: Frustum (n.) The part of a solid next the base, formed by cutting off the, top; or the part of any solid, as of a cone, pyramid, etc., between two planes, which may be either parallel or inclined to each other..

Pyramoid :: Pyramoid (n.) See Pyramidoid.

Scalenohedron :: Scalenohedron (n.) A pyramidal form under the rhombohedral system, inclosed by twelve faces, each a scalene triangle..

Pyramidical :: Pyramidical (a.) Of or pertaining to a pyramid; having the form of a pyramid; pyramidal.

Quartzoid :: Quartzoid (n.) A form of crystal common with quartz, consisting of two six-sided pyramids, base to base..

Pyramid :: Pyramid (n.) 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.

Altitude :: Altitude (n.) The perpendicular distance from the base of a figure to the summit, or to the side parallel to the base; as, the altitude of a triangle, pyramid, parallelogram, frustum, etc..

Pyramidoid :: Pyramidoid (n.) A solid resembling a pyramid; -- called also pyramoid.

Berylloid :: Berylloid (n.) A solid consisting of a double twelve-sided pyramid; -- so called because the planes of this form occur on crystals of beryl.

Macroprism :: Macroprism (n.) A prism of an orthorhombic crystal between the macropinacoid and the unit prism; the corresponding pyramids are called macropyramids.

Pyramidic :: Pyramidic (a.) Alt. of Pyramidica.

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