Kapok
WordNet
noun
(1) 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
(2) A plant fiber from the kapok tree; used for stuffing and insulation
WiktionaryText
Noun
- A silky fibre obtained from the silk-cotton tree used for insulation and stuffing for pillows, mattresses, etc.