caustic

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From the Latin causticus (“burning”), from Ancient Greek καυστικός (kaustikós, “burning”), from καυστός (kaustós, “burnt”) + -ικός (-ikós).

Capable of burning, corroding or destroying organic tissue.
usually Sharp, bitter, cutting, biting, and sarcastic in a scathing way. "How now!" said Scrooge, caustic and cold as ever.

countable, uncountable Any substance or means which, applied to animal or other organic tissue, burns, corrodes, or destroys it by chemical action; an escharotic. The association of the heavenly bodies with known metals and also with human organs and destinies goes back to ancient Chaldea, the land of astrologers. In Chaucer’s words: ‘The seven bodies eek, lo hear anon. Sol gold is, and Luna silver we declare; Mars yron, Mercurie is quyksilver; Saturnian leed
countable, uncountable The envelope of reflected or refracted rays of light for a given surface or object.
countable, uncountable The envelope of reflected or refracted rays for a given curve.
informal, uncountable Caustic soda.