Crossword Genius

Twin air-intakes under a bridge (8)

Ross

I believe the answer is:

nostrils

I'm a little stuck... Click here to teach me more about this clue!

'twin air-intakes' is the definition.
Although both the answer and definition are plural nouns, I can't see how one could define the other.

I cannot understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for nostrils that I've seen before include "Nose-openings" , "Openings to the nasal cavity" , "Slit Ron's nose parts" , "Openings in the nose" , "Openings in nasal cavities" .)

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