Scrabble?! CAUSTIC

Definitions of CAUSTIC in various dictionaries:

noun - any chemical substance that burns or destroys living tissue

adj - harsh or corrosive in tone

adj - of a substance, especially a strong acid

Capable of burning, corroding, dissolving, or eating away by chemical action.

Corrosive and bitingly trenchant; cutting.

Causing a burning or stinging sensation, as from intense emotion: “Most of all, there is caustic shame for my own stupidity” (Scott Turow).

Of or relating to light emitted from a point source and reflected or refracted from a curved surface.

A caustic material or substance.

A hydroxide of a light metal.

A caustic curve or surface.

noun - a corrosive substance