Definitions
1.nounAny substance or means which, applied to animal or other organic tissue, burns, corrodes, or destroys it by chemical action; an escharotic.
2.nounThe envelope of reflected or refracted rays of light for a given surface or object.
3.nounThe envelope of reflected or refracted rays for a given curve.
4.nounCaustic soda.
5.adjectiveCapable of burning, corroding or destroying organic tissue.
6.adjective(of language, etc.) Sharp, bitter, cutting, biting, and sarcastic in a scathing way.