Hypertext Webster Gateway: "tergum"
From Webster's Revised Unabridged Dictionary (1913) (web1913)
Tergum \Ter"gum\, n.; pl. {Terga}. [L., the back.] (Zo["o]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.
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