The innermost layer of the pericarp (fruit wall) that directly surrounds the seed. It can be membranous, woody, or stony, and often forms the 'pit' or 'stone' of drupes.
From Greek 'endon' (within) and 'karpos' (fruit), meaning 'inner fruit layer.' The term was coined in the 19th century as botanists developed precise terminology for the complex layered structure of fruit walls.
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