middle body noun2 •The midsection of the body.Buttocks, lower back, and perineum burns occur when a child's middle body is forcibly held under hot water. — 2006 •The part of a vessel adjacent to the midship section having a uniform or nearly uniform cross-section, usually referred to as the parallel middle body.In those experiments the different models used had varying lengths of parallel middle body distributed equally forward and abaft the midship section. — 1919 formsmiddle bodies
