- caustic⇄adj. 1. that burns or destroys flesh; corrosive. Lye is caustic soda or caustic potash.
2. (Figurative.) very critical or sarcastic; stinging; biting.
Ex. The speaker gave a caustic answer to the man who interrupted with a silly question. Th - caustic⇄adv. caustically.
- caustic⇄caustic, adjective, noun.
- caustic⇄noun 1. a substance that burns or destroys flesh; corrosive substance.
Ex. My warts were burned away by the caustic put on them.
2. (in optics) a caustic curve or surface.