Meaning of CAUSTIC in English

CAUSTIC

caus ‧ tic /ˈkɔːstɪk $ ˈkɒːs-/ BrE AmE adjective

[ Date: 1300-1400 ; Language: Latin ; Origin: causticus , from Greek , from kaiein 'to burn' ]

1 . a caustic substance can burn through things by chemical action:

caustic soda (=a chemical used for cleaning things)

2 . a caustic remark criticizes someone in a way that is unkind but often cleverly humorous SYN acerbic

caustic wit/comments/remark etc

Eliot appreciated Pound’s caustic wit.

—caustically /-kli/ adverb :

‘I can hardly wait,’ Sir Trevor replied caustically.

Longman Dictionary of Contemporary English.      Longman - Словарь современного английского языка.