the GNU version of the Collaborative International Dictionary of English
adj. Of or pertaining to the mesothorax.
The Century Dictionary and Cyclopedia
Of or pertaining to the mesothorax of an insect.
Word Usage
"The last of the indirect neck muscles connects the base of the endosternum to the supraneural bridge of the mesothoracic endosternum, and is thus a retractor of the propectus"