Crossword Genius

Cavity in the facial bones (5)

Ross

I believe the answer is:

sinus

<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">cavity in the facial bones</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is all the clue.<br/ ></span>

(Other definitions for sinus that I've seen before include "Hole in the head" , "Cavity in the facial bones" , "Anatomical cavity" , "Bodily cavity" , "Nasal cavity" .)

I've seen this clue in The Times.
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