Noun
A narrow-necked vessel having two handles and bellying out like a jug.
A cruet for the wine and water at Mass.
The vase in which the holy oil for chrism, unction, or coronation is kept.
Any membranous bag shaped like a leathern bottle, as the dilated end of a vessel or duct; especially the dilations of the semicircular canals of the ear.
Source: Webster's dictionaryAll jawed vertebrates also possess three semicircular canals arising from the utricle, each with an ampulla containing sensory cells at one end. Source: Internet
Life restoration William Abler observed in 2001 that Albertosaurus tooth serrations resemble a crack in the tooth ending in a round void called an ampulla. Source: Internet
The use of a drill to create an "ampulla" of sorts and prevent the propagation of cracks through material is also used to protect aircraft surfaces. Source: Internet