The clue "Caustic compound" last appeared in the Wall Street Journal crossword on December 9, 2025. The correct answer for this puzzle is "ACID", a 4-letter word.
Solution ACID is our most searched for solution by our visitors. Solution ACID is 4 letters long. We have 0 further solutions of the same word length.
There are 3 solutions. The longest is PHENOL with 6 letters, and the shortest is LYE with 3 letters.
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Solutions are between 3 and 6 letters long.