endocarpyoudaoicibaDictYouDict[endocarp 词源字典]
"The innermost layer of the pericarp which surrounds a seed in a fruit. It may be membranous (as in apples) or woody (as in the stone of a peach or cherry)", Early 19th century: from endo- 'within' + a shortened form of pericarp.[endocarp etymology, endocarp origin, 英语词源]