pentacron

From Ancient Greek πέντε (pénte, “five”) + ἄκρον (ákron, “summit”).

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pentacron (plural pentacra)

1. (archaic, geometry) A solid with five summits (vertices), such as a square pyramid

• “pentacron”, in Webster’s Revised Unabridged Dictionary, Springfield, Mass.: G. & C. Merriam, 1913, →OCLC.