a plant fiber from the kapok tree; used for stuffing and insulation
<noun.substance>
massive tropical tree with deep ridges on its massive trunk and bearing large pods of seeds covered with silky floss; source of the silky kapok fiber
<noun.plant>
Kapok \Ka*pok"\, n. [Prob. fr. the native name.] (Bot.) A silky wool derived from the seeds of {Ceiba pentandra} (syn. {Eriodendron anfractuosum}), a bombaceous tree of the East and West Indies. [Webster 1913 Suppl.]