activator
[ ak-tuh-vey-ter ]
/ ˈæk təˌveɪ tər /
Save This Word!
noun
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.
QUIZZES
THINK YOU’VE GOT A HANDLE ON THIS US STATE NICKNAME QUIZ?
Did you ever collect all those state quarters? Put them to good use on this quiz about curious state monikers and the facts around them.
Question 1 of 8
Mississippi’s nickname comes from the magnificent trees that grow there. What is it?
OTHER WORDS FROM activator
non·ac·ti·va·tor, nounWords nearby activator
Dictionary.com Unabridged
Based on the Random House Unabridged Dictionary, © Random House, Inc. 2021
Example sentences from the Web for activator
Medical definitions for activator
activator
[ ăk′tə-vā′tər ]
n.
An agent that renders another substance active or accelerates a process or reaction.
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.