What does endocarp mean?
The endocarp is the innermost of the three layers that make up the pericarp, or fruit wall, of flowering plants — the other two being the outer exocarp and the middle mesocarp. Its character varies widely across species: in fleshy fruits such as grapes and tomatoes the endocarp is soft and membranous, while in drupes like peaches, cherries, olives, and coconuts it hardens into the familiar woody or stony pit that encases the seed. Because of this protective role, the term is central to botanical descriptions of fruit structure and to discussions of seed dispersal, since a tough endocarp can shield seeds from digestion by animals or delay germination until conditions are favourable. The word derives from Greek roots meaning 'within' and 'fruit', entered English scientific vocabulary in the nineteenth century, and remains a formal, specialist term rather than part of everyday speech.
nounThe innermost layer of the wall (pericarp) of a fruit, surrounding the seed(s); in drupes such as peaches and cherries it forms the hard stony pit.
- The innermost layer of a fruit's pericarp, which in drupes develops into the hard stony pit enclosing the seed.
"When she split the peach pit open with a hammer, the endocarp revealed the single almond-like seed inside."
"Botanists divide the fruit wall into three layers: exocarp, mesocarp, and endocarp."
"The coconut's thick woody endocarp is what makes the shell so difficult to break."
Regular plural, used when discussing multiple fruits or comparing structures across species.
"Drupes are distinguished from berries by their hard endocarps."
The peach's hard, uncrackable 'stone' isn't a seed at all — it's the endocarp, a layer of fruit tissue so tough it has been found intact after millions of years in fossil deposits.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Etymology of endocarp
The word endocarp comes from modern Latin, formed from the Greek elements 'endo-' meaning 'within' and 'karpos' meaning 'fruit'. It entered English scientific vocabulary in the early nineteenth century as botanists systematised the terminology of fruit anatomy alongside the parallel terms exocarp and mesocarp. It shares its root 'karpos' with cognate botanical terms such as pericarp and carpel.
How endocarp is actually used
A technical term used almost exclusively in botany and horticulture; rare in everyday speech, where speakers simply say 'pit' or 'stone'. Formal register.
Easily confused with endocarp
Pericarp is the entire fruit wall, while the endocarp is only its innermost layer, enclosing the seed.