What does aril mean?
An aril is a botanical term for an extra layer or outgrowth that covers or partly encloses a seed, usually arising from the point where the seed attaches to the fruit. Arils are often fleshy, brightly colored, and sweet, serving to attract animals that eat them and disperse the seeds. Well-known examples include the juicy red pulp surrounding each pomegranate seed, the scarlet cup around yew seeds, and the delicate lacy covering known as mace that wraps around the nutmeg kernel — making the aril directly responsible for two beloved spices and one popular fruit. The word is technical rather than colloquial, appearing mainly in botany, horticulture, and food writing, where precision about which part of a plant is being described matters. Understanding "aril" helps clarify common confusions: what we casually call a pomegranate "seed" is largely aril, not seed proper. It is a countable noun whose plural is simply "arils," and it carries no strong connotations beyond its vivid, sensory associations with color and flavor.
nounAn aril is an extra covering or appendage on a seed, typically a fleshy, often brightly colored outgrowth that partially or fully encases it. Familiar examples include the red, lacy flesh surrounding a nutmeg seed and the juicy pulp around pomegranate seeds.
- A specialized outgrowth or covering that develops from the funiculus (seed stalk) and partially or wholly envelops a seed, as in nutmeg, yew, and pomegranate.
"The pomegranate's glistening seeds owe their sweetness to the succulent aril that envelops each one."
"In the yew tree, each seed sits within a bright red, cup-shaped aril that birds find irresistible."
"Mace, the spice prized by medieval merchants, is simply the dried lacy aril wrapped around the nutmeg kernel."
Standard regular plural; used when referring to multiple seed coverings, e.g., across several seeds or species.
"The botanist noted that the arils of this species are orange rather than red."
That ruby-red juice you love in a pomegranate? Botanically speaking, you're not eating the seed — you're slurping its aril.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Etymology of aril
The word "aril" entered English in the late 18th century, borrowed from French "arille," which itself derives from New Latin "arillus." Its deeper origin is uncertain, though some sources connect it to a Late Latin term for a grape pip or seed. It remains a specialist borrowing from scientific Latin vocabulary, with no widely recognized English cognates.
How aril is actually used
Aril is a technical term used chiefly in botany and horticulture; it rarely appears in everyday conversation except in discussions of fruits like pomegranate. It is a countable noun with the standard plural "arils." The related terms "arillate" (bearing an aril) and "arillus" exist but are uncommon outside specialist literature.
Easily confused with aril
"Aerial" means relating to the air or aircraft, while "aril" is the botanical term for a fleshy seed covering; they share similar sounds but nothing else.