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.