Tergum
Pronunciation : Ter"gum
Part of Speech : n.;
Etymology : [L., the back.] (Zo?l.) (a) The back of an animal. (b) The dorsal piece of a somite of an articulate animal. (c) One of the dorsal plates of the operculum of a cirriped.
Definition :
pl. Terga.
Source : Webster's Unabridged Dictionary, 1913