femur femorotibial • fen · · · Info · Definitions · Synonyms · Characters · · femur · · Text Latin · · Script 5 · · Length Definitions · · · (noun) the longest and thickest bone of the human skeleton; extends from the pelvis to the knee. Synonyms: thighbone, femoris. · · Noun Definition 1 Synonyms · · · thighbone · · Synonym 1 femoris · · Synonym 2 Characters · · e latin small letter e U+0065 f latin small letter f U+0066 m latin small letter m U+006D r latin small letter r U+0072 u latin small letter u U+0075