MEANING: adjective: 1. Capable of burning or corroding.
2. Highly critical; sarcastic.

ETYMOLOGY: From Latin causticus, from Greek kaustikos, from kaustos (combustible), from kaiein, (to burn). Earliest documented use: 1555.

CRUSTIC - what you paint on top of a roll so the seeds won't fall off

CAUSTIN - 100 capitals of Texas

CAMUSTIC - the author of The Stranger has an involuntary twitch on his cheek