a person or thing that energizes.
Pharmacology. antidepressant(def 2).

Origin of energizer

First recorded in 1740–50; energize + -er1
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

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Word Origin and History for energizer

1750, agent noun from energize.

Online Etymology Dictionary, © 2010 Douglas Harper