worm
From The Oxford Companion to Spirits & Cocktails
is a time-honored tool for condensing the alcohol vapor coming off a still. It consists of a coiled copper tube bathed in a tub of cold water. Its invention is attributed to the Italian physician-alchemist Taddeo Alderotti in the thirteenth c entury. See also
This definition is from The Oxford Companion to Spirits & Cocktails, edited by David Wondrich (Editor-in-Chief) and Noah Rothbaum (Associate Editor).