prothorax

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Related to Prosternum: Propleuron

prothorax

(prō-thôr′ăks′)
n. pl. pro·thoraxes or pro·thoraces (-thôr′ə-sēz′)
The anterior division of the thorax of an insect, bearing the first pair of legs.

pro′tho·rac′ic (-thə-răs′ĭk) adj.

prothorax

the first thoracic segment in insects.