# Small container, shaped like a drinking glass. Used to measure and/or serve a small amount or single swallow of liquor. A shot glass is also known as a Jigger or Pony.
www.danish-schnapps-recipes.com/dictionary-s.html
# A small glass that holds exactly 1 1/2 oz of liquid. Ordering a drink in one of these is called a shot, or shooter or jigger.
www.whiskeydicksbar.com/term.htm
# a small glass adequate to hold a single swallow of whiskey
wordnet.princeton.edu/perl/webwn
# Traditionally, a shot glass was a small, thick glass designed to measure one ounce of liquid, usually liquor, to be either drunk straight, or poured into a mixed drink. Markings, if any, indicated the quantity of fluid at different levels.
en.wikipedia.org/wiki/Shot_glass
http://tinyurl.com/8ehon