n. 1. A soft drink (such as root beer) with a scoop or two of ice cream floating in it. 2. A small amount of liquid (such as liqueur or cream) that sits atop another liquid without mixing in. float v. To slowly pour a liquid (such as liqueur or cream) onto the top of another liquid so that it floats on top of the liquid below. In the case of a pousse-café, several liquids are floated, one on top of the other, so as not to mix together.
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.