1
2
: marked by incisive sarcasm
a caustic film review
caustic humor
3
: relating to or being the surface or curve of a caustic (see caustic entry 2 sense 2)
1
: a caustic agent: such as
a
: a substance that burns or destroys organic tissue by chemical action
b
: a strong corrosive alkali (such as sodium hydroxide)
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Merriam-Webster unabridged
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