Is “Caustic” a Scrabble word?
Yes
CAUSTIC
Valid in at least one Scrabble dictionary
Valid in these dictionaries
SOWPODS / CSW
Scrabble UK & International
TWL / NWL
Scrabble North America
Large English Dictionary
General English word list
Meaning of Caustic
/ˈkɒstɪk/
noun
1.Any substance or means which, applied to animal or other organic tissue, burns, corrodes, or destroys it by chemical action; an escharotic.
2.The envelope of reflected or refracted rays of light for a given surface or object.
3.The envelope of reflected or refracted rays for a given curve.
adjective
1.Capable of burning, corroding or destroying organic tissue.
2.(of language, etc.) Sharp, bitter, cutting, biting, and sarcastic in a scathing way.
Synonyms: acidic, biting, burning, corrosive, searing, bitchy