This clue appeared in the NYT Crossword on Saturday, February 28, 2026 (25 Across). The answer is hidden below until you want it. Saturday puzzles are the hardest of the week and themeless, so clues are often deliberately misleading.
Answer length: 4 squares
First letter
T _ _ _
First and last letters
T _ _ S
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About the answer
TRIS as a word: (organic chemistry) A phosphoric acid ester C₉H₁₅Br₆O₄P formerly used to flameproof clothes and especially children's nightclothes until it was found to caus...; (organic chemistry) A flammable compound which forms a corrosive solution in water and is used as a buffer and emulsifying agent.
TRIS has been an answer 2 times in the NYT Crossword and Mini since February 28, 2026.
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