What does epicarp mean?
Epicarp is a botanical term denoting the outermost layer of the pericarp — the wall of tissue that forms from the ovary after fertilisation and encloses a fruit's seed or seeds. In familiar terms, it corresponds to what most people call the skin, peel, or rind of a fruit: the waxy surface of an apple, the leathery exterior of a plum, or the oil-rich zest of an orange. The term is chiefly encountered in botany, pomology, and horticultural writing, where precision about fruit structure matters; everyday speech favours 'peel' or 'skin'. The word derives from Greek roots meaning 'upon' and 'fruit', reflecting its position as the layer lying on the outside of the pericarp. Understanding it alongside its companion terms mesocarp and endocarp allows one to describe a fruit's anatomy with scientific exactness.
nounThe outermost layer of the pericarp of a fruit; in everyday terms, the skin or peel of a fruit.
- The outermost layer of the pericarp of a fruit; the skin or rind of a fruit.
"The epicarp of the orange is rich in aromatic oils that perfume the zest."
"In citrus fruits, the epicarp contains oil glands that release their scent when the peel is squeezed."
"The drupe's epicarp is thin and smooth, enclosing a fleshy mesocarp around the hard stone."
The plural is regular but uncommon; the singular is typically used when discussing fruit anatomy generally.
"The epicarps of these two cultivars differ markedly in thickness."
That orange peel you're holding? Botanists have a precise name for it — and it comes straight from the Greek word for fruit.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Etymology of epicarp
Epicarp entered English in the early nineteenth century as a technical term in botany, formed from the Greek prefix epi- ('upon, outer') combined with karpos ('fruit'). It was coined to name the outermost stratum of the pericarp, complementing the parallel terms mesocarp and endocarp, which denote the middle and innermost layers respectively. The same Greek root karpos underlies related botanical vocabulary such as carpel and carpology.
How epicarp is actually used
A technical botanical term used mainly in botany and horticulture; rare in general conversation, where 'skin' or 'peel' would normally be preferred.
Easily confused with epicarp
Pericarp is the entire fruit wall comprising all layers, whereas epicarp is only its outermost layer.
Mesocarp is the middle layer of the fruit wall (often the fleshy part), while epicarp is the outer skin.