Noun
One that displaces.
The funnel part of the apparatus for solution by displacement.
Source: Webster's dictionaryMore than a traveler, I'm a displacer. In other words, I'm a person who is constantly meditating on what it means not to arrive at a place, but to be on my way somewhere else. Ariel Dorfman
If compressed, it can replace compressed natural gas for use in vehicles, where it can fuel an internal combustion engine or fuel cells and is a much more effective displacer of carbon dioxide than the normal use in on-site CHP plants. Source: Internet
Stirling piston engine Rhombic Drive – Beta Stirling Engine Design, showing the second displacer piston (green) within the cylinder, which shunts the working gas between the hot and cold ends, but produces no power itself. Source: Internet