oto·cyst \ˈōd.əˌsist\noun Etymology: International Scientific Vocabulary ot- + -cyst; originally formed as French otocyste 1.: one of the supposed auditory organs of many invertebrates that contains a fluid and otoliths : statocyst 2.: otic vesicle • oto·cys·tic\| ̷ ̷ ̷ ̷|sistik\adjective