lumbus lumbrous • lumen · · · Info · Definitions · Synonyms · Characters · · lumbus · · Text Latin · · Script 6 · · Length 2 · · Syllables Definitions · · · (noun) either side of the backbone between the hipbone and the ribs in humans as well as quadrupeds. Synonyms: loin. · · Noun Definition 1 Synonyms · · · loin · · Synonym 1 Characters · · b latin small letter b U+0062 l latin small letter l U+006C m latin small letter m U+006D s latin small letter s U+0073 u latin small letter u U+0075