ANOSMIA (a, priv., and ὄσμη, odor), a deprivation of the olfactory sense: a singular affection, and fortunately of rare occurrence. Anosmia has sometimes occurred as a congenital defect; but it more generally has its origin in a diseased state of the membrana mucosa itself. The habituation of the olfactory to strong stimuli has been known to produce a similar effect.