Definition of air duct
1 : a duct or pipe for conveying air (as to the rooms of a house or ship for ventilation or to a furnace)
2 : the duct connecting the air bladder and alimentary canal of certain fishes
Love words? You must — there are over 200,000 words in our free online dictionary, but you are looking for one that’s only in the Merriam-Webster Unabridged Dictionary.
Join MWU now and get access to America’s largest dictionary, with:
- 300,000 words that aren't in our free dictionary
- Expanded definitions, etymologies, and usage notes
- Advanced search features
- Ad free!
First Known Use of air duct
Seen and Heard
What made you want to look up air duct? Please tell us where you read or heard it (including the quote, if possible).