Defn: A plane figure having five angles, and, consequently, five sides; any figure having five angles. Regular pentagon, a pentagon in which the angles are all equal, and the sides all equal.
PENTAGONAL Pen*tag"o*nal, a. Etym: [Cf. F. pentagonal, pentagone, L. pentagonus, pentagonius, Gr.
Defn: Having five corners or angles. Pentagonal dodecahedron. See
Dodecahedron, and Pyritohedron.
PENTAGONALLY
Pen*tag"o*nal*ly, adv.
Defn: In the form of a pentagon; with five angles. Sir T. Browne.
PENTAGONOUS
Pen*tag"o*nous, a.
Defn: Pentagonal.
PENTAGRAM
Pen"ta*gram, n. Etym: [Gr. Penta-, and -gram.]
Defn: A pentacle or a pentalpha. "Like a wizard pentagram." Tennyson.
PENTAGRAPHIC; PENTAGRAPHICAL Pen`ta*graph"ic, Pen`ta*graph"ic*al, a. Etym: [Corrupted fr. pantographic, -ical.]