The clue "Square root of 81" last appeared in the Universal crossword on May 10, 2020. The correct answer for this puzzle is "NINE", a 4-letter word.
Solution NINE is 4 letters long. So far we haven´t got a solution of the same word length.
There is 1 solutions. The longest is NINE with 4 letters, and the shortest is NINE with 4 letters.
No, "SQUARE ROOT OF 81" hasn´t seen a spike right now. Solvers are most interested in: Gene, IN itself, Aqua ___, Widespread and Related.
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The solution is 4 letters long.