osmometer \os*mom"e*ter\ ([o^]z"m[o^]m"[-e]*t[~e]r or [o^]s"m[o^]m"[-e]*t[~e]r), n. [Gr. 'wsmo`s impulse + -meter.] (Physics) An instrument for measuring the amount of osmotic action in different liquids. [1913 Webster]