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releaser

[ri-lee-ser] /rɪˈli sər/
noun
1.
a person or thing that releases.
2.
Ethology. a key stimulus, as a sound, odor, moving shape, or patch of color, that elicits a predictable behavioral response in an animal.
Origin
1425-1475
1425-75; late Middle English. See release, -er1
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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