pyramidal
 (a.)金字塔形的,角錐狀的,錐體的錐骨


 py·ram·i·dal /pəˈræmədḷ/ 形容詞
 (拉pyramidalis)金字塔形的,錐形的,錐體的


 Py·ram·i·dal a.
 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).

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 pyramidal
      adj : resembling a pyramid [syn: pyramidic, pyramidical]