__ acid

The answer to “__ acid” in the The Washington Post crossword is AMINO — a 5-letter word. It most recently appeared in the The Washington Post crossword on August 30, 2026, a Sunday puzzle, at 26-Across, and it has also run on 1 earlier date with the same answer. Below you'll find why that fill fits, every other answer we've recorded for this clue, and links into the puzzle it came from.

“__ acid” answer

AMINO (5 letters)

Reveal the solution one letter at a time with the tiles above if you'd rather nudge yourself toward it than see the whole word at once. Just want it outright? The answer is AMINO.

What does AMINO mean?

Reading the plain dictionary sense of AMINO is often the fastest way to see why it answers this clue.

When else has “__ acid” appeared?

The Washington Post reuses clues across dates, sometimes with a different answer depending on the grid. Here's where this exact clue has shown up, and what the answer was each time — handy when you're checking whether today's fill is the only one.

• August 30, 2026 (most recent) → AMINO
• August 18, 2026 → AMINO

Frequently asked questions