— magnesian , adj.
/mag nee"zheuh, -sheuh/ , n.
a white, tasteless substance, magnesium oxide, MgO, used in medicine as an antacid and laxative. Cf. milk of magnesia .
[ 1350-1400; ME: philosophers' stone magnesia he ) Magnesía ( líthos ) (the stone) of MAGNESIA; sense development obscure ]