A small nut, often used in Cyperaceae for their often small hardened fruits.
(In Cyperaceae) hardened, usually minute, one-seeded fruit, the surface of which may be smooth to variously patterned and a diagnostic character for many species. Often called an achene in literature on Cyperaceae.
A small or diminutive nut, similar to an achene but with a harder, thicker wall.
Diminutive of nut; the stone of a drupe.
Occurs in a dry fruit that separates into several (usually 4) small, 1-seeded, nutlike segments. Especially found in families Verbenaceae, Labiatae, and Boraginaceae.