alligator clip

noun Electricity.
  1. a type of terminal for making temporary electrical connections, consisting of a cliplike device with long, narrow jaws that resemble those of an alligator.

Origin of alligator clip

First recorded in 1940–45
Also called alligator clamp.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018