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词汇 protopyramid
释义

Definition of protopyramid in English:

protopyramid

noun

  • The primitive pyramid of a crystal system, in which the horizontal axes of the system intersect the edges of the pyramid (as opposed to one in which the axes intersect the faces midway between the edges).

Origin

Late 19th century; earliest use found in The Century Dictionary.

Definition of protopyramid in US English:

protopyramid

noun

  • The primitive pyramid of a crystal system, in which the horizontal axes of the system intersect the edges of the pyramid (as opposed to one in which the axes intersect the faces midway between the edges).

Origin

Late 19th century; earliest use found in The Century Dictionary.
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