Clue: An acid
An acid is a crossword puzzle clue that we have spotted 4 times. There are related clues (shown below).
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Recent usage in crossword puzzles:
- USA Today Archive - July 26, 1999
- USA Today Archive - Sept. 3, 1997
- New York Times - Jan. 18, 1994
- New York Times - Jan. 11, 1990