Search the Dictionary

ool 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, un…

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.

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.

The small pyramid which crowns or completes an obelisk.

A solid resembling a pyramid; -- called also pyramoid. Barlow.

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

See Macroprism.

igure to the summit, or to the side parallel to the base; as, the altitude of a triangle, pyramid, parallelogram, frustum, etc.

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

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.

s of a complex structure; to agree with a pattern. Known by the name of uniformity; Where pyramids to pyramids relate And the whole fabric doth configurate. Jordan.

ighted on solemn occasions. It is sometimes formed of double or triple circlets, arranged pyramidically. Called also corona lucis. Fairholt.

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

or fix the time of, as of an event; to give the date of; as, to date the building of the pyramids.

A pointed projection, like a four-sided pyramid, used for ornament in lines or groups.

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

id 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.

ng to or exhibiting that kind of organic form, in which the stereometric ground form is a pyramid, with similar poles. See Promorphology.

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