資料來源 : Webster's Revised Unabridged Dictionary (1913)

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.