n. Same as Grommet. [ 1913 Webster ]
n. [ Gr. &unr_; wet, moist + -meter: cf. F. hygromètre. ] (Physics) An instrument for measuring the degree of moisture of the atmosphere. [ 1913 Webster ]
Daniell's hygrometer,
n. [ Cf. F. hygrométrie. ] (Physics) That branch of physics which relates to the determination of the humidity of bodies, particularly of the atmosphere, with the theory and use of the instruments constructed for this purpose. [ 1913 Webster ]