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f an orthorhombic crystal between the macropinacoid and the unit prism; the corresponding pyramids are called macropyramids.

ed. -- Nail-headed molding (Arch.), an ornament consisting of a series of low four-sided pyramids resembling the heads of large nails; -- called also nail-head molding, or nail-head. It is the same as the simplest form of dogtooth. See Dogtooth.

An upright, four-sided pillar, gradually tapering as it rises, and terminating in a pyramid called pyramidion. It is ordinarily monolithic. Egyptian obelisks are commonly covered with hieroglyphic writing from top to bottom.

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

which can not be divided into any other figure more simple than itself, as a triangle, a pyramid, etc. -- Prime meridian (Astron.), the meridian from which longitude is reckoned, as the meridian of Greenwich or Washington. -- Prime minister, the responsible head of a ministry or executive government; applied particu…

rt, insignificant person; a dwarf. Pygmies are pygmies still, though perched on Alps. And pyramids are pyramids in vales. Young.

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

A pyramid.

See Pyramidoid.

A form of crystal common with quartz, consisting of two six- sided pyramids, base to base.

To turn upside down; to invert. A pyramid reversed may stand upon his point if balanced by admirable skill. Sir W. Temple.

ght; erect from a base; having an upright axis; not oblique; as, right ascension; a right pyramid or cone.

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.

crystal bounded by four equal isosceles triangles. It is the hemihedral form of a square pyramid.

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…

Approaching the form of a three-sided pyramid; as, the subtrihedral crown of a tooth. Owen.

Regularly narrowed toward the point; becoming small toward one end; conical; pyramidical; as, taper fingers.

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 pit in the form of an inverted cone or pyramid, constructed as an obstacle to the approach of an enemy, and having a pointed stake in the middle. The pits are called also trapholes.