: an undercoat of fur especially when thick and soft
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In contrast, New World porcupines—those found in North and South America—have individual quills interspersed with sensory guard hairs, bristles, and underfur.—Encyclopedia Britannica, 26 May 2026 The first coat is often dense underfur packed closely against the skin, like a warm base layer.—Wes Siler, Outside Online, 30 June 2022 The visitor center and gift shop are in a historic Matanuska Colony barn where visitors can purchase garments woven from qiviut, the underfur that combed from the musk ox.—Bob Hallinen, Anchorage Daily News, 4 May 2018