Crossword Genius

Body cavity (5)

Ross

I believe the answer is:

sinus

<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">body cavity</span>' is the definition.<br/ ><span class="explanation-format__explanation">(sinus is a kind of body cavity)</span><br/ ><br/ >This is all the clue.<br/ ></span>

(Other definitions for sinus that I've seen before include "Cavity linked to nose" , "Air cavity in the cranial bones" , "Bodily cavity" , "Head space" , "Cavity in the facial bones" .)

I've seen this clue in the Canadiana, The Independent, the Evening Standard and the New York Times.
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