double boiler: Meaning and Definition of

dou'ble boil'er

Pronunciation: [key]
  1. a utensil consisting of two pots, one of which fits partway into the other: water is boiled in the lower pot to cook or warm food or melt a substance in the upper.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.