Crossword Genius

Prefix for thermal (3)

Ross

I believe the answer is:

geo

<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">prefix for thermal</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>

I've seen this clue in the Newsday.com and the Newsday.
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