Origin of air duct
Examples from the Web for air duct
But who would think of putting a burglar alarm on an air-duct?The Romantic Analogue|W.W. Skupeldyckle
The ancient conception of the artery as an air-duct gave rise to the derivation from Gr.
These fishes have lost the air-duct and on the whole they show the greatest development of the greatest number of structures.A Guide to the Study of Fishes, Volume 1 (of 2)|David Starr Jordan