chemical reaction is a noun meaning "(chemistry) a process in which one or more substances are changed into others". It carries one recorded sense.
(chemistry) a process in which one or more substances are changed into others
“there was a chemical reaction of the lime with the ground water”
chemistry
Definitions, synonyms and semantic relations for chemical reaction come from Princeton University’s WordNet. Commonness is measured against a corpus of everyday English. Full sources and licences.