Prothorax

[prәu'θɒ:ræks]

(noun.) the anterior part of an insect's thorax; bears the first pair of legs.

Typed by Agatha--From WordNet

(n.) The first or anterior segment of the thorax in insects. See Illusts. of Butterfly and Coleoptera.

Editor: Moll

n. the anterior segment of the thorax of insects.—adj. Prothorac′ic (-ras-).

Checked by Horatio