caustic (envelope of reflected or refracted rays of light for a given surface or object) · caustic (envelope of reflected or refracted rays for a given curve)
caustic (capable of burning, corroding or destroying organic tissue) · caustic (sharp, bitter, cutting, biting, and sarcastic in a scathing way)
köken: Learned borrowing from Koine Greek καυστικός (kaustikós) and from French caustique, from Latin causticus, from Ancient Greek καυστικός (kaustikós).