Pyramidal

4 definitions found

From The Collaborative International Dictionary of English v.0.48 [gcide]:

  Pyramidal \Py*ram`i*dal\, a. [Cf. F. pyramidal.]
     [1913 Webster]
     1. Of or pertaining to a pyramid; in the form of a a pyramid;
        pyramidical; as, pyramidal cleavage.
        [1913 Webster]
  


              The mystic obelisks stand up
              Triangular, pyramidal.                --Mrs.
                                                    Browning.
        [1913 Webster]
  
     2. (Crystallog.) Same as {Tetragonal}.
        [1913 Webster]
  
     {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.
        [1913 Webster]

From The Collaborative International Dictionary of English v.0.48 [gcide]:

  Pyramidal \Py*ram"i*dal\, n. (Anat.)
     One of the carpal bones. See {Cuneiform}, n., 2
     (b) .
         [1913 Webster]

From The Collaborative International Dictionary of English v.0.48 [gcide]:

  Cuneiform \Cu*ne"i*form\, Cuniform \Cu"ni*form\, n.
     1. The wedge-shaped characters used in ancient Persian and
        Assyrian inscriptions. --I. Taylor (The Alphabet).
        [1913 Webster]
  
     2. (Anat.)
        (a) One of the three tarsal bones supporting the first,
            second third metatarsals. They are usually designated
            as external, middle, and internal, or {ectocuniform},
            {mesocuniform}, and {entocuniform}, respectively.
        (b) One of the carpal bones usually articulating with the
            ulna; -- called also {pyramidal} and {ulnare}.
            [1913 Webster]

From WordNet (r) 2.0 [wn]:

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