legs (or tears)
From The Oxford Companion to Spirits & Cocktails
refer to the trail of liquid left by a spirit on the inside of a glass when it is tilted or swirled. Observing the quality of the legs as a determinant of body is a common step in the initial visual assessment of a liquor during a tasting session. Thick, slow-moving legs indicate greater viscosity, which may be a function of more advanced age, higher alcohol, or added sugar.
McGhee, Harold. On Food and Cooking: The Science and Lore of the Kitchen, rev. ed. New York: Scribner, 2004.
By: David Mahoney
This definition is from The Oxford Companion to Spirits & Cocktails, edited by David Wondrich (Editor-in-Chief) and Noah Rothbaum (Associate Editor).