Nasal openings (8)
I believe the answer is:
nostrils
'nasal openings' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for nostrils that I've seen before include "Nose holes" , "Openings in nasal cavities" , "Openings in the nose" , "Nose-openings" , "Narial openings" .)