the inner layer of the pericarp of a ripened ovary or fruit, as the pit surrounding the seed of a drupe
Origin of endocarpendo- + -carp
The inner layer of the pericarp of a fruit, which can be soft, such as the pulp of an orange, or hard, such as the stone of a peach.
cutaway of a peach
endo- + Ancient Greek καρπός (karpos, “fruit”); endo- + -carp.