1. Also called a shot or shot glass, a jigger is a small drinking glassshaped container that usually holds about 1½ ounces, but can also be a 1- or 2-ounce size. It's generally used to measure liquor. 2. The term is also used to describe the quantity of liquid such a measure holds, as in "a jigger of whiskey."See also pony; shot.
From The Food Lover's Companion, Fourth edition by Sharon Tyler Herbst and Ron Herbst. Copyright © 2007, 2001, 1995, 1990 by Barron's Educational Series, Inc.