ampulla
Noun
Meaning
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 dictionarySynonyms
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All jawed vertebrates also possess three semicircular canals arising from the utricle, each with an ampulla containing sensory cells at one end.
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.
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.