magnesia magnes • magnesial · · · Info · Definitions · Synonyms · Characters · · magnesia · · Text Latin · · Script 8 · · Length Definitions · · · (noun) a white solid mineral that occurs naturally as periclase; a source of magnesium. Synonyms: periclase, magnesium oxide. · · Noun Definition 1 Synonyms · · · periclase · · Synonym 1 magnesium oxide · · Synonym 2 Characters · · a latin small letter a U+0061 e latin small letter e U+0065 g latin small letter g U+0067 i latin small letter i U+0069 m latin small letter m U+006D n latin small letter n U+006E s latin small letter s U+0073