Medical Definition of ampulla
plural am·pul·lae \-ˌlē\play
: a saccular anatomic swelling or pouch: asa: the dilatation containing a patch of sensory epithelium at one end of each semicircular canal of the earb: one of the dilatations of the lactiferous tubules of the mammary glands that serve as reservoirs for milkc: the middle portion of the fallopian tube: the distal dilatation of a vas deferens near the opening of the duct leading from the seminal vesicled: a terminal dilatation of the rectum just before it joins the anal canal
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