The envelope of reflected or refracted rays for a given curve.
Caustic soda.
The envelope of reflected or refracted rays of light for a given surface or object.
Any substance or means which, applied to animal or other organic tissue, burns, corrodes, or destroys it by chemical action; an escharotic.
Capable of burning, corroding or destroying organic tissue.
Sharp, bitter, cutting, biting, and sarcastic in a scathing way.