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Meaning of activator

ac•ti•va•tor

Pronunciation: (ak'tu-vā"tur), [key]
— n.
  1. a person or thing that activates.
  2. a catalyst.
  3. any impurity in a mineral that causes luminescence. Cf. inhibitor (def. 3).
  4. 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.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.
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