innerspring

[ in-er-spring ]
/ ˈɪn ərˌsprɪŋ /

adjective

having or characterized by a large number of enclosed coil springs within an overall padding: innerspring construction.

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Origin of innerspring

First recorded in 1925–30; inner + spring
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2020