[ak-tuh-vey-ter] 
| 1. | a person or thing that activates. |
| 2. | Chemistry, Biochemistry. a catalyst. |
| 3. | any impurity in a mineral that causes luminescence. Compare inhibitor (def. 3). |
| 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. |
| ac·ti·vate (āk'tə-vāt') tr.v. ac·ti·vat·ed, ac·ti·vat·ing, ac·ti·vates
|
activator ac·ti·va·tor (āk'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.
təˌveɪ