Definitions from Wiktionary ( )

▸ adjective:  Capable of burning, corroding or destroying organic tissue.
▸ adjective:  (of language, etc.) Sharp, bitter, cutting, biting, and sarcastic in a scathing way.
▸ noun:  Any substance or means which, applied to animal or other organic tissue, burns, corrodes, or destroys it by chemical action; an escharotic.
▸ noun:  (optics, computer graphics) The envelope of reflected or refracted rays of light for a given surface or object.
▸ noun:  (mathematics) The envelope of reflected or refracted rays for a given curve.
▸ noun:  (informal, chemistry) Caustic soda.

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