Source : Webster's Revised Unabridged Dictionary (1913)

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.

Source : WordNet®

Ceiba pentandra
     n : 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 [syn: {kapok}, {ceiba
         tree}, {silk-cotton tree}, {white silk-cotton tree}, {Bombay
         ceiba}, {God tree}]