Definition of Piramidal
Py*ram`i*dal (?), a. [Cf. F.
pyramidal.]
1. 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.
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.
Py*ram"i*dal (?), n. (Anat.)
One of the carpal bones. See Cuneiform,
n., 2 (b).
- Webster's Unabridged Dictionary (1913)
- Pyramid-shaped.
- Huge, colossal.
- (Anatomy) One of the carpal bones.
- The Nuttall Encyclopedia
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