(of a mattress) having coil springs inside a padded casing
innerspring in American English
(ˈinərˌsprɪŋ)
adjective
having or characterized by a large number of enclosed coil springs within an overall padding
innerspring construction
Word origin
[1925–30; inner + spring]This word is first recorded in the period 1925–30. Other words that entered Englishat around the same time include: buildup, decibel, gimmick, hot spot, recycle