Crossword clue: (chemistry) a substance other than a catalyst that facilitates the start of a catalytic reaction

The most common answer is sensitiser (10 letters).

2 answers found in Letterora's clue database (Wikidata facts, Open Trivia DB, WordNet and Webster definitions — all licensed sources).

Possible answers

sensitiser 10 letters wn-def

(chemistry) a substance other than a catalyst that facilitates the start of a catalytic reaction

sensitizer 10 letters wn-def

(chemistry) a substance other than a catalyst that facilitates the start of a catalytic reaction