Crossword Genius

Triatomic form of oxygen (5)

Ross

I believe the answer is:

ozone

<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">triatomic form of oxygen</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >This is all the clue.<br/ ></span>

(Other definitions for ozone that I've seen before include "Layer that protects against ultraviolet rays" , "By sea, you could take in this" , "lively atmosphere" , "Sea air (found in layer?)" , "Bracing air (colloq.)" .)

I've seen this clue in The Guardian.
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