releaser

[ ri-lee-ser ]

/ rɪˈli sər /

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noun

a person or thing that releases.

Ethology. a key stimulus, as a sound, odor, moving shape, or patch of color, that elicits a predictable behavioral response in an animal.

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Origin of releaser

1425–75; late Middle English. See release, -er¹

In a third (No. 45) the fortieth room contains a golden horse and a golden dog which assist their bold releaser.
Russian Fairy Tales|W. R. S. Ralston
Their reddish facial suffusion serves as a social releaser which elicits hostile behavior and facilitates sex recognition.
Life History and Ecology of the Five-lined Skink, Eumeces fasciatus|Henry S. Fitch
One day she sang of Death the releaser, and Ruark thought, ''Tis come!
The Shaving of Shagpat, Complete|George Meredith
If such music-making is ever to become accepted, then I long for Death the Releaser.
Ivory Apes and Peacocks|James Huneker