a. [ Cf. F. pentagonal, pentagone, L. pentagonus, pentagonius, Gr. &unr_;. ] Having five corners or angles. [ 1913 Webster ]
Pentagonal dodecahedron. See Dodecahedron, and Pyritohedron. [ 1913 Webster ]
adv. In the form of a pentagon; with five angles. Sir T. Browne. [ 1913 Webster ]