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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.

Spire :: Spire (n.) 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 tapering part of a steeple, or the steeple itself..

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

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

Pyramidia :: Pyramidia (pl. ) of Pyramidio.

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

Trou-de-loup :: Trou-de-loup (n.) 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..

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

Pyramidal :: Pyramidal (a.) Of or pertaining to a pyramid; in the form of a a pyramid; pyramidical; as, pyramidal cleavage..

Subtriple :: Subtrihedral (a.) Approaching the form of a three-sided pyramid; as, the subtrihedral crown of a tooth..

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..

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

Right :: Right (a.) Upright; erect from a base; having an upright axis; not oblique; as, right ascension; a right pyramid or cone..

Obelisk :: Obelisk (n.) 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..

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

Sphenoid :: Sphenoid (n.) A wedge-shaped crystal bounded by four equal isosceles triangles. It is the hemihedral form of a square pyramid.

Homopolic :: Homopolic (a.) In promorphology, pertaining to or exhibiting that kind of organic form, in which the stereometric ground form is a pyramid, with similar poles. See Promorphology..

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

Pyramidal :: Pyramidal (n.) One of the carpal bones. See Cuneiform, n., 2 (b)..

Corona :: Corona (n.) A crown or circlet suspended from the roof or vaulting of churches, to hold tapers lighted on solemn occasions. It is sometimes formed of double or triple circlets, arranged pyramidically. Called also corona lucis..

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