pyramidal
/pɪˈɹæm.ɪ.dl̩/ adjective, noun
Forms pyramidals
- adjective (geometry) Pyramid-shaped.
- adjective (crystallography) Tetragonal.
- noun (anatomy) One of the carpal bones.
Synonyms
Etymology
From Middle English piramidal, piramydale, from Medieval Latin pȳramidālis. By surface analysis, pyramid + -al.
Webster’s 1913
- adjective Of or pertaining to a pyramid; in the form of a a pyramid; pyramidical; as, pyramidal cleavage.
- adjective 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 trangular pyramidal numbers; and 1, 5, 14, 30, 55, etc., are square pyramidal numbers.
- noun One of the carpal bones. See Cuneiform, n., 2 (b).
Etymology [Cf. F. pyramidal.]
Sources: Wiktionary · WordNet 3.0 · Webster’s 1913 — from the Wiktionary entry “pyramidal”, CC BY-SA 4.0. Details