Enter a clue or pattern or both:

The Clue

Catalyst (9 letter answer)

The Answer

ACTIVATOR

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Notes

The answer ACTIVATOR is so rare that it appears less than once every 2500 puzzles.

Definition

ACTIVATOR as a noun:

1. (biology) any agency bringing about activation; a molecule that increases the activity of an enzyme or a protein that increases the production of a gene product in DNA transcription