Cavity in the body (5)
I believe the answer is:
sinus
(Other definitions for sinus that I've seen before include "Cavity in the facial bones" , "Passage in the head" , "Hole in the head" , "Hollow space" , "Nasal cavity" .)
I believe the answer is:
sinus
(Other definitions for sinus that I've seen before include "Cavity in the facial bones" , "Passage in the head" , "Hole in the head" , "Hollow space" , "Nasal cavity" .)