a. [f. as prec. -AR: cf. F. quinquangulaire.] Having five angles or corners; pentagonal.
1653. H. More, Antid. Ath., II. vi. (1712), 54. If it [a stone] be but exactly round … or ordinately Quinquangular.
1657. Tomlinson, Renou’s Disp., 258. The leaves of Briony are broad, and quinquangular.
1704. Collect. Voy. (Churchill), III. 701/1. The … Fortress … was of a Quinquangular Figure.
1826. in Kirby & Sp., Entomol., IV. 262.
1872. E. Trollope, Sleaford, 430. Its east end terminates in a quinquangular apse.
So Quinquangulate, -ous adjs. (Lee, Introd. Bot., 1788; Mayne, Expos. Lex., 1858).
