ampulla of Lorenzini

[ lawr-uh n-zee-nee ]
/ ˌlɔr ənˈzi ni /

noun Ichthyology.

any of an array of electroreceptors in the head of sharks, skates, and rays capable of detecting weak electrical signals produced by muscular activity in other creatures.

Origin of ampulla of Lorenzini

after Italian physician Stefano Lorenzini (flourished 1678), who first described them