displacer

[dis-pley-ser]
noun
1.
a person or thing that displaces.
2.
plum ( def 10 ).

Origin:
1580–90; displace + -er1

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World English Dictionary
displace (dɪsˈpleɪs)
 
vb
1.  to move from the usual or correct location
2.  to remove from office or employment
3.  to occupy the place of; replace; supplant
4.  to force (someone) to leave home or country, as during a war
5.  chem to replace (an atom or group in a chemical compound) by another atom or group
6.  physics to cause a displacement of (a quantity of liquid, usually water of a specified type and density)
 
dis'placeable
 
adj
 
dis'placer
 
n

Collins English Dictionary - Complete & Unabridged 10th Edition
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Example sentences
The displacer motion is affected by a gas spring action between the power piston and the displacer rod.
Displacer and piston have reached bottom dead center together.
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