fiberfill

[ fahy-ber-fil ]
/ ˈfaɪ bərˌfɪl /

noun

synthetic fibers, as polyester, used as a filling or insulating material for pillows, cushions, comforters, winter garments, etc.

Origin of fiberfill

An Americanism dating back to 1960–65; fiber + fill
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019