[n] the hard inner (usually woody) layer of the pericarp of some fruits (as peaches or plums or cherries or olives) that contains the seed; "you should remove the stones from prunes before cooking"
\En"do*carp\, n. [Endo- + Gr. ? fruit: cf. F. endocarpe.] (Bot.) The inner layer of a ripened or fructified ovary.