Pronunciation: (mez"u-thôr'aks, -thōr'-, mes"-, mē"zu-, -su-), [key]
—pl. -tho•rax•es, -tho•ra•cesPronunciation: (-thôr'u-sēz", -thōr'-). [key]
the middle segment of the three divisions of the thorax of an insect, bearing the second pair of legs and the first pair of wings.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.