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Definition of Pyramidal
Py`ram`i`dal | a. | 1. | | | 1. | Of or pertaining to a pyramid; in the form of a a pyramid; pyramidical; as, pyramidal cleavage. | | 2. | (Crystallog.) Same as Tetragonal.| Pyramidal numbers | | (Math.) certain series of figurate numbers expressing the number of balls or points that may be arranged in the form of pyramids. Thus 1, 4, 10, 20, 35, etc., are triangular pyramidal numbers; and 1, 5, 14, 30, 55, etc., are square pyramidal numbers. |
| | n. | 1. | (Anat.) One of the carpal bones. See Cuneiform, n., 2 (b). |
Related Words
pointed, pyramidic, pyramidical
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