ampulla of Lorenzini
noun phrase
ampulla of Lo·ren·zi·ni -ˌlȯr-ən-ˈzē-nē 
: any of the pores on the snouts of marine sharks and rays that contain receptors highly sensitive to weak electric fields
Word History
Etymology
after Stefano Lorenzini 17th-century Italian physician
Note: The ampullae were described by Lorenzini in Osservazioni intorno alle torpedini (Florence, 1678).
First Known Use
1892, in the meaning defined above