Crossword Genius

Tiny air holder in a lung (3)

Ross

I believe the answer is:

sac

(Other definitions for sac that I've seen before include "Pouchlike structure" , "Membranous cavity" , "Traditional entitlement to hold court" , "Bag, pouch; cyst" , "Distended membrane; pouch-like cavity" .)

I've seen this clue in the Universal.
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