lumbo- Look up lumbo- at Dictionary.com
word-forming element used since 19c. and meaning "loin, loins," from Latin lumbus "hip, loin" (usually plural), from Proto-Italic *londwo- "loins," from PIE *lendh- (1) "loin" (source also of Sanskrit randhra- "loin (of animals);" Old Church Slavonic ledvije (plural) "loins, kidneys, insides; soul," Russian ljadveja (archaic) "thigh;" Old English lendenu "loins," Old Norse lend, German Lende "loin," Lenden "loins").