proactivator

[ prō-ăktə-vā′tər ]

n.

A substance that, when enzymatically split, yields a fragment capable of activating another substance or process.

QUIZZES

CAN YOU ACE THIS QUIZ ABOUT “COMPLIMENT” VS. “COMPLEMENT”?

Take this quiz to see if you really know the difference between “compliment” and “complement"!
Question 1 of 11
“Compliment” and “complement” had a shared meaning a long time ago, but today they are no longer interchangeable.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.