semicircular canal

WordReference Random House Unabridged Dictionary of American English © 2025

semicir′cular canal′, [Anat.]

1. Anatomy any of the three curved tubular canals in the labyrinth of the ear, associated with the sense of equilibrium. See diag. under ear. 

• 1740–50

Collins Concise English Dictionary © HarperCollins Publishers::

semicircular canal noun

1. any of the three looped fluid-filled membranous tubes, at right angles to one another, that comprise the labyrinth of the ear: concerned with the sense of orientation and equilibrium