It Speeds Up a Reaction but Is Not Changed Itself

This page is the CodyCross answer for the clue below from Tracking Time, Group 1058, Puzzle 3 (Julien Le Roy).

Question is: It Speeds Up a Reaction but Is Not Changed Itself

and the answer is: CATALYST

Word Meaning:

CATALYST — (chemistry) A substance that increases the rate of a chemical reaction without being consumed in the process.

Definitions from Wiktionary.

It speeds up a reaction but is not changed itself — CodyCross Answer | CodyCross Solutions