Pen‐tag″o‐nal (?), a. [Cf. F. pentagonal, pentagone, L. pentagonus, pentagonius, Gr. �.] Having five corners or angles.
Pentagonal dodecahedron. See Dodecahedron, and Pyritohedron.
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Webster's Dictionary 1913
Webster's Revised Unabridged Dictionary, C. & G. Merriam Co., 1913.