caustic

Any substance or means which, applied to animal or other organic tissue, burns, corrodes, or destroys it by chemical action; an escharotic.

The envelope of reflected or refracted rays of light for a given surface or object.

The envelope of reflected or refracted rays for a given curve.

Caustic soda.

Capable of burning, corroding or destroying organic tissue.

(of language, etc.) Sharp, bitter, cutting, biting, and sarcastic in a scathing way.