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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.

Like a pyramid.

Consisting of two pyramids placed base to base; having a pyramid at each of the extremities of a prism, as in quartz crystals.

A hammer with a head formed of a bundle of square bars, with pyramidal points, arranged in rows, or a solid head with a face cut into a number of rows of such points; -- used for dressing stone.

One of the carpal bones usually articulating wich the ulna; -- called also pyramidal and ulnare.

A hydrated arseniate of copper, occurring in obtuse pyramidal crystals of a sky-blue or verdigris-green color.

A pyramidal form of inflorescence, in which the cluster is loosely branched below and gradually simpler toward the end.

A low tower, having a truncated pyramidal form, and flanking an ancient Egyptian gateway. Massive pylons adorned with obelisks in front. J. W. Draper.

Of or pertaining to a pyramid; having the form of a pyramid; pyramidal. " A pyramidical rock." Goldsmith. "Gold in pyramidic plenty piled." Shenstone. -- Pyr`a*mid"ic*al*ly, adv. Pyr`a*mild"ic*al*ness, n.

A many-sided pyramidal head upon a nail; also a nail with such a head.

A pyramidal form under the rhombohedral system, inclosed by twelve faces, each a scalene triangle.

A tapering body that shoots up or out to a point in a conical or pyramidal form. Specifically (Arch.), the roof of a tower when of a pyramidal form and high in proportion to its width; also, the pyramidal or aspiring termination of a tower which can not be said to have a roof, such as that of Strasburg cathedral; the t…

Literally, God's house; a temple, usually of pyramidal form, such as were built by the aborigines of Mexico, Yucatan, etc. And Aztec priests upon their teocallis Beat the wild war-drums made of serpent's skin. Longfellow.

A temple tower of the Babylonians or Assyrians, consisting of a lofty pyramidal structure, built in successive stages, with outside staircases, and a shrine at the top.