'Hydromagnesite' definitions:

Definition of 'Hydromagnesite'

From: GCIDE

Hydromagnesite \Hy`dro*mag"ne*site\ (h[imac]`dr[-o]*m[a^]g"n[-e]*s[imac]t), n. [Hydro-, 1 + magnesite.] (Min.) A hydrous carbonate of magnesia occurring in white, earthy, amorphous masses. [1913 Webster]