unˈdecimal, a.
[f. L. undecim eleven.]
Characterized in some way by the number eleven.
| 1804 Shaw Gen. Zool. V. i. 24 Undecimal Silure... Silure with single dorsal fin of eleven rays. 1845 Encycl. Metrop. XXV. 1397/1 The numeration [of the New Zealanders] is undecimal by successive multiples of eleven. |