The clue "Heaviest known metal, Os" last appeared in the The Guardian Quick crossword on October 28, 2021. The correct answer for this puzzle is "OSMIUM", a 6-letter word.
Solution OSMIUM is 6 letters long. So far we haven´t got a solution of the same word length.
There is 1 solutions. The longest is OSMIUM with 6 letters, and the shortest is OSMIUM with 6 letters.
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The solution is 6 letters long.