n. [ Hydro-, 1 + magnesite. ] (Min.) A hydrous carbonate of magnesia occurring in white, earthy, amorphous masses. [ 1913 Webster ]
n. [ Cf. F. magnésite. ] (Min.) Native magnesium carbonate occurring in white compact or granular masses, and also in rhombohedral crystals. [ 1913 Webster ]
n. [ Nitro- + magnesite. ] (Chem.) Nitrate of magnesium, a saline efflorescence closely resembling nitrate of calcium. [ 1913 Webster ]