Hypertext Webster Gateway: "prothorax"
From Webster's Revised Unabridged Dictionary (1913) (web1913)
Prothorax \Pro*tho"rax\, n. [Pref. pro- + thorax.] (Zo["o]l.)
The first or anterior segment of the thorax in insects. See
Illusts. of {Butterfly} and {Coleoptera}.
From WordNet (r) 1.7 (wn)
prothorax
n : the anterior part of an insect's thorax; bears the first
pair of legs
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