dead-air space

[ ded-air ]

noun

1. an unventilated air space in which the air does not circulate.

Word History and Origins

Origin of dead-air space¹

First recorded in 1900–05

Example Sentences

To achieve this unheard-of level of versatility, Alpha employs a knit construction with the full structural integrity of a fabric and creates downlike dead-air space without the need for breathability-reducing container fabrics.

From Outside Online