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semi·cir·cu·lar canal

n :  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 usu. in planes nearly at right angles to each other - see SEMICIRCULAR DUCT  .
 
 

 
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