Source : Webster's Revised Unabridged Dictionary (1913)

Osphradium \Os*phra"di*um\, n.; pl. {Osphradia}. [NL., fr. Gr. ?
   strong scent, fr. ? to smell.] (Zo["o]l.)
   The olfactory organ of some Mollusca. It is connected with
   the organ of respiration.