单词 | heptacron |
释义 | > as lemmasheptacron heptacron n. Brit. /ˈhɛptəkrɒn/ , U.S. /ˈhɛptəˌkrɑn/ a solid figure having seven vertices.Π 1862 A. Cayley Coll. Math. Papers (1892) V. 42 The derivation of the octacrons from the heptacrons... The heptacron has more than two tripleural summits. < as lemmas |
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