a. [ Micro- + acoustic: cf. F. microcoustique, micracoustique. ] Pertaining, or suited, to the audition of small sounds; fitted to assist hearing. [ 1913 Webster ]
n. An instrument for making faint sounds audible, as to a partially deaf person. [ 1913 Webster ]
Microcosmic salt (Chem.),
Microcosmic salt (Chem.),