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fiberfill

[fahy-ber-fil]
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noun
  1. synthetic fibers, as polyester, used as a filling or insulating material for pillows, cushions, comforters, winter garments, etc.
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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. 2018