caustic Meaning in the Cambridge English Dictionary
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Meaning of “caustic” in the English Dictionary

"caustic" in British English

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causticadjective

uk   /ˈkɔː.stɪk/  us   /ˈkɑː-/

caustic adjective (CHEMICAL)

A caustic ​chemicalburns or ​destroys things, ​especially anything made of ​livingcells: a caustic ​substance

caustic adjective (WORDS)

A caustic ​remark or way of ​speaking is hurtful, critical, or ​intentionallyunkind: caustic ​comments She's ​famous in the ​office for her caustic ​wit.
caustically
adverb uk   /ˈkɔː.stɪ.kəl.i/  us   /ˈkɑː-/
(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/
stronglycritical: a caustic ​remark chemistry Caustic ​meansable to ​burn through things.
(Definition of caustic from the Cambridge Academic Content Dictionary © Cambridge University Press)
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