air drain
/ˈɛː dreɪn/noun
1A covered channel round the external walls of a building to prevent damp.
2A device through which air is drained. rare.
Origin
Mid 19th century. From air + drain.
- backswimmer
- backswing
- backsword
- back talk
- backtalking
- back the wrong horse
- back-to-back
- back to front
- back-to-nature
- back to (or at) square one
- back-to-school
- back to the drawing board
- backtrack
- back-translation
- back up
- backup
- backup light
- backveld
- backvelder
- backward
- backwardation
- backward caste
- backward class
- backward classes
- backward-compatible