kapokEnglishOxford New American Dictionarykapok /ˈkāˌpäk, ˈkeɪˌpɑk / ▸ noun a fine, fibrous substance like cotton that grows around the seeds of the ceiba tree, used as stuffing for cushions, soft toys, etc. ▪ (also kapok tree) another term for ceiba. – ORIGIN mid 18th century : from Malay kapuk.