Quantcast
Merriam-Webster Logo
  • Dictionary
  • Thesaurus
  • Scrabble
  • Spanish Central
  • Learner's Dictionary

Medical Dictionary

activator

play
noun ac·ti·va·tor \ˈak-tə-ˌvāt-ər\

Medical Definition of activator

  1. 1:  a substance (as a chloride ion) that increases the activity of an enzyme—compare coenzyme

  2. 2:  a substance given off by developing tissue that stimulates differentiation of adjacent tissue; also :  a structure giving off such a stimulant




Seen and Heard

What made you want to look up activator? Please tell us where you read or heard it (including the quote, if possible).

WORD OF THE DAY

at a gallop

Get Word of the Day daily email!