Meaning of “caustic” in the English Dictionary

"caustic" in British English

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causticadjective

uk /ˈkɔː.stɪk/ us /ˈkɑː.stɪk/

caustic adjective (WORDS)

A caustic remark or way of speaking is hurtful, critical, or intentionally unkind:

caustic comments
She's famous in the office for her caustic wit.
caustically
adverb uk /ˈkɔː.stɪ.kəl.i/ us /ˈkɑː.stɪ.kəl.i/

(Definition of “caustic” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)

"caustic" in American English

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causticadjective

us /ˈkɔ·stɪk/

strongly critical:

a caustic remark

chemistry Caustic means able to burn through things.

(Definition of “caustic” from the Cambridge Academic Content Dictionary © Cambridge University Press)