Is “Caustic” a Scrabble word?

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Yes
CAUSTIC
Valid in at least one Scrabble dictionary

Valid in these dictionaries

SOWPODS / CSW
Scrabble UK & International
Valid
TWL / NWL
Scrabble North America
Valid
Large English Dictionary
General English word list
Valid

Meaning of Caustic

/ˈkɒstɪk/

noun
  1. 1.Any substance or means which, applied to animal or other organic tissue, burns, corrodes, or destroys it by chemical action; an escharotic.

  2. 2.The envelope of reflected or refracted rays of light for a given surface or object.

  3. 3.The envelope of reflected or refracted rays for a given curve.

adjective
  1. 1.Capable of burning, corroding or destroying organic tissue.

  2. 2.(of language, etc.) Sharp, bitter, cutting, biting, and sarcastic in a scathing way.

Synonyms: acidic, biting, burning, corrosive, searing, bitchy