stirrup definition ear
2. stirrup-the stirrup-shaped ossicle that transmits sound from the incus to the cochlea. stapes. auditory ossicle-ossicles of the middle ear that transmit acoustic vibrations from the eardrum to the inner ear. middle ear, tympanic cavity, tympanum-the main cavity of the ear; between the eardrum and the inner ear.. A flat-based loop or ring hung from either side of a horse's saddle to support the rider's foot in mounting and riding; a stirrup iron. 2. A part or device shaped like an inverted U in which something is supported, held, or fixed.