tergum
Ter"gum, n.; pl. Terga. Etym: [L., the back.] (Zoöl.) (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.
Ter"gum, n.; pl. Terga. Etym: [L., the back.] (Zoöl.) (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.