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The following 3 entries include the term semicircular.
membranous semicircular canal
nounsemicircular canal
noun: any of the loop-shaped tubular parts of the labyrinth of the ear that together constitute a sensory organ associated with the maintenance of bodily equilibrium, that consist of an inner membranous canal of the membranous labyrinth and a corresponding outer bony canal of the bony labyrinth, and that in all vertebrates above cyclostomes form a group of three in each ear usually in planes nearly at right angles to each other see semicircular duct
semicircular duct
noun: 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
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Merriam-Webster unabridged
