View your list of saved words. (You can log in using Facebook.)
Definition of SEMICIRCULAR DUCT
: any of the three loop-shaped membranous inner tubular parts of the semicircular canals that are about one-fourth the diameter of the corresponding outer bony canals, that communicate at each end with the utricle, and that have near one end an expanded ampulla containing an area of sensory epithelium—called also membranous semicircular canal
Seen & Heard
What made you want to look up semicircular duct? Please tell us where you read or heard it (including the quote, if possible).