decuman

Etymology
From, from.

Adjective

 * 1)  Large; chief; applied to an extraordinary billow, supposed by some to be every tenth in sequence.
 * 2)  Connected with the principal gate of an Ancient Roman camp, near which the tenth cohort of the legion was stationed.
 * 1)  Connected with the principal gate of an Ancient Roman camp, near which the tenth cohort of the legion was stationed.

Noun

 * 1)  An extraordinarily large billow.