M0250000 (mĕt′ə-thôr′ăks′)n.pl.met·a·tho·rax·es or met·a·tho·ra·ces(-thôr′ə-sēz′) The hindmost of the three divisions of the thorax of an insect, bearing the third pair of legs and the second pair of wings.met′a·tho·rac′ic(-thə-răs′ĭk) adj.EncyclopediaSeemetathorax