资料来源 : pyDict

双锥体

资料来源 : Webster's Revised Unabridged Dictionary (1913)

Bipyramidal \Bi`py*ram"i*dal\, a. [Pref. bi- + pyramidal.]
   Consisting of two pyramids placed base to base; having a
   pyramid at each of the extremities of a prism, as in quartz
   crystals.