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activator

American  
[ak-tuh-vey-ter] / ˈæk təˌveɪ tər /

noun

  1. a person or thing that activates.

  2. Chemistry, Biochemistry. a catalyst.

  3. any impurity in a mineral that causes luminescence.

  4. 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.

Other Word Forms

  • nonactivator noun

Etymology

Origin of activator

activate + -or 2

Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023

Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.