sacral vertebra sacral vein • sacrament · · · Info · Definitions · Characters · · sacral vertebra · · Text Common · · Latin · · Scripts 15 · · Length 5 · · Syllables Definitions · · · (noun) one of 5 vertebrae in the human spine that fuse in the adult to form the sacrum. Synonyms: sacral vertebra. · · Noun Definition 1 Characters · · space U+0020 a latin small letter a U+0061 b latin small letter b U+0062 c latin small letter c U+0063 e latin small letter e U+0065 l latin small letter l U+006C r latin small letter r U+0072 s latin small letter s U+0073 t latin small letter t U+0074 v latin small letter v U+0076