noun
: a device (as a metal cup with notches or slots around the edge) that is inverted over a hole in a plate in a bubble tower for effecting contact of vapors rising from the plate below and liquid already on the plate
noun
: a device (as a metal cup with notches or slots around the edge) that is inverted over a hole in a plate in a bubble tower for effecting contact of vapors rising from the plate below and liquid already on the plate
Webster's New International English Dictionary. Новый международный словарь английского языка Webster. 2012