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| 单词 | peri-octahedral |
| 释义 | > as lemmasperi-octahedral a. Forming adjectives designating prisms derived from four-sided prisms by the development of secondary facets on their edges to give prisms the numbers of whose sides are indicated by the second element, as peri-decahedral, peri-dodecahedral, peri-hexahedral, peri-octahedral, peri-polygonal. Obsolete. rare. ΚΠ 1817 R. Jameson Treat. External Characters Minerals (ed. 3) 193 Peri-hexahedral, peri-octahedral, peri-decahedral, and peri-dodecahedral, when the primitive four-sided prism is changed by means of decrements into a six, eight, ten or twelve sided prism. 1817 R. Jameson Treat. External Characters Minerals (ed. 3) 202 Peri-polygonal (F. peri-polygone), when the prism has a great number of lateral planes, such as the peri-polygonal tourmaline. < as lemmas |
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