substantia alba substant • substantiability · · · Info · Definitions · Synonyms · Characters · · substantia alba · · Text Common · · Latin · · Scripts 15 · · Length 6 · · Syllables Definitions · · · (noun) whitish nervous tissue of the CNS consisting of neurons and their myelin sheaths. Synonyms: white matter, substantia alba. · · Noun Definition 1 Synonyms · · · white matter · · Synonym 1 Characters · · space U+0020 a latin small letter a U+0061 b latin small letter b U+0062 i latin small letter i U+0069 l latin small letter l U+006C n latin small letter n U+006E s latin small letter s U+0073 t latin small letter t U+0074 u latin small letter u U+0075