Crossword clue: a poisonous product formed by pathogenic bacteria, as a toxic proteid or poisonous ptomaine.

The most common answer is toxin (5 letters).

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

Possible answers

toxin 5 letters web-def

a poisonous substance produced during the metabolism and growth of certain microorganisms and some higher plant and anim

toxine 6 letters web-def

A poisonous product formed by pathogenic bacteria, as a toxic proteid or poisonous ptomaine.