A small, hollow, spherical metal bell with a narrow slit opening or small holes, containing a loose ball or rod as a clapper, which is attached to a horse's harness as a signal, or (music) used as a musical instrument.
an object so suspended inside a bell that it may hit the bell and cause it to ring; a clapper
the slight elevation in the mucous membrane immediately behind the internal urethral orifice of the urinary bladder, caused by the middle lobe of the prostate