British spelling variant of causticizer; a substance or agent that renders something caustic, or something that makes harsh or corrosive.
From caustic plus -ise (British suffix for making or treating) plus -r (agent noun). This is a technical term formed following British conventions for creating agent nouns from verbs.
British English loves the -ise suffix while American English prefers -ize, and dictionaries had to record both versions. This word is so specialized that even most native speakers have never encountered it in actual use.
Agent noun with masculine '-er' default in historical usage. If referring to person, gendered assumption embedded.
Use 'caustic commentator' or 'sharp critic' to avoid gendered agent noun.
["caustic commentator","sharp critic","satirist"]
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