a person or thing that activates.
Chemistry, Biochemistry. a catalyst.
any impurity in a mineral that causes luminescence. Compare inhibitor ( def 3 ).
Orthodontics. a removable appliance, usually of hard plastic, that is worn in the mouth instead of a fixed appliance to help align the teeth and improve the relationship of the lower jaw to the upper.

activate + -or2

nonactivator, noun Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
activate (ˈæktɪˌveɪt)
1.  to make active or capable of action
2.  physics to make radioactive
3.  chem
 a.  to increase the rate of (a reaction)
 b.  to treat (a substance, such as carbon or alumina) so as to increase powers of adsorption
4.  physiol to prepare by arousal (the body or one of its organs (e.g. the brain)) for action
5.  to purify (sewage) by aeration
6.  (US) military to create, mobilize, or organize (a unit)

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Medical Dictionary

activator ac·ti·va·tor (āk'tə-vā'tər)

  1. An agent that renders another substance active or accelerates a process or reaction.

  2. The fragment produced by chemical cleavage of a proactivator that induces the enzymatic activity of another substance.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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Example sentences
It's an enzyme activator, a cell growth factor, and a component of cell membranes.
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