Answer: airsac

AnswerCrossword Clue
AIRSACAlveolus
AIRSACRespiratory cavity
AIRSACBird's buoyancy aid
AIRSACLung compartment
AIRSACLung cell
AIRSACBird's organ
AIRSACHollow space in birds
AIRSACPart of the lung
AIRSACBird's breathing aid
AIRSACBird's breathing apparatus
AIRSACCanary's cavity
AIRSACAvian lung outgrowth
AIRSACHollow part of a bird
AIRSACLung feature
AIRSACBird's temperature regulator aid
AIRSACBird's body feature