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The Collaborative International Dictionary
Polyacron

Polyacron \Pol`y*a"cron\, n.; pl. Polyacra, E. Polyacrons. [NL., fr. Gr. poly`s many + 'a`kron summit.] (Geom.) A solid having many summits or angular points; a polyhedron.

Wiktionary
polyacron

n. (context geometry English) A solid having many summits or angular points; a polyhedron.