prothorax Meaning, Definition & Usage

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

WordNet

Pro*tho"rax noun
Etymology
Pref. pro- + thorax.
Definitions
  1. (Zoöl.) The first or anterior segment of the thorax in insects. See Illusts. of Butterfly and Coleoptera.

Webster 1913