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Synonyms
caus·tic (kốstĭk)

[Middle English caustik, from Latin causticus, from Greek kaustikos, from kaustos, from kaiein, kau-, to burn.]

adjective 

  1. Capable of burning, corroding, dissolving, or eating away by chemical action.
  2. Corrosive and bitingly trenchant; cutting. See synonyms at sarcastic
  3. Causing a burning or stinging sensation, as from intense emotion: “Most of all, there is caustic shame for my own stupidity” (Scott Turow)

noun 

  1. A caustic material or substance.
  2. A hydroxide of a light metal.
  3. The enveloping surface formed by light rays reflecting or refracting from a curved surface, especially one with spherical aberration.

derivatives

cauśti·cal·ly
adverb
caus·tići·ty
noun