‖Pol′y‐a″cron (?), n.; pl.Polyacra (#), E. Polyacrons (#). [NL., fr. Gr. πολύσ many + ἄκρον summit.] (Geom.) A solid having many summits or angular points; a polyhedron.
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Webster's Dictionary 1913
Webster's Revised Unabridged Dictionary, C. & G. Merriam Co., 1913.