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pyramidal    音标拼音: [pɚ'æmədəl]
a. 金字塔形的,角锥状的,锥体的
n. 锥骨

金字塔形的,角锥状的,锥体的锥骨

pyramidal
adj 1: resembling a pyramid [synonym: {pyramidal}, {pyramidic},
{pyramidical}]

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]


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


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]


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