| Part of Speech | Definition | |
| Adjective | 1. Consisting of two pyramids placed base to base; having a pyramid at each of the extremities of a prism, as in quartz crystals.[Websters]
2. Rarely used base adjective of the adverb bipyramidally.[Eve - graph theoretic] | |
| Adverb Form (bipyramidally) | 1. Virtually never used adverbial inflection of the rarely used adjective bipyramidal.[Eve - graph theoretic] | |
Source: Webster's Revised Unabridged Dictionary (1913), compiled from various sources, under license. | Top | |
Date "BIPYRAMIDAL" was first used in popular English literature: sometime before 1914. (references) |
| Note: Bipyramidal \Bi`py*ram"i*dal\, adjective. [Prefix bi- pyramidal.]. (references) |
Common Expressions: BIPYRAMIDAL
| Expressions | Definition | ||
| Trigonal bipyramidal | In chemistry a trigonal bipyramid is a molecular geometry with one atom at the center and 5 more at the corners of a trigonal bipyramid. Phosphorus pentachloride is a molecule with a trigonal bipyramidal geometry. Phosphorus shares a plane with three chloride atoms at 120 degrees angles of each other (equatorial positions) and two more above and below at 90 degrees of the plane (apical positions). (references) | ||
Source: compiled by the editor from various references; see credits. | Top | ||
