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The Collaborative International Dictionary of English v.0.48:

Pentacron \Pen*ta"cron\, n.; pl. L. Pentacra, E. Pentacrons.
   [NL., fr. Gr. pe`nte five + 'a`kron a summit.] (Geom.)
   A solid having five summits or angular points.
   [1913 Webster]