Pen‐ta″cron (?), n.; pl. L. Pentacra (#), E. Pentacrons (#). [NL., fr. Gr. πέντε five + ἄκρον a summit.] (Geom.) A solid having five summits or angular points.
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Webster's Dictionary 1913
Webster's Revised Unabridged Dictionary, C. & G. Merriam Co., 1913.