What is "achene"

Achene \A*chene"\, Achenium \A*che"ni*um\n. [Gr. 'a priv. + ? to gape.] (Bot.) A small, dry, indehiscent fruit, containing a single seed, as in the buttercup; -- called a naked seed by the earlier botanists. [Written also akene and ach[ae]nium.]

n. (context botany English) A small, dry, indehiscent fruit, containing a single seed, as in the buttercup.

n. small dry indehiscent fruit with the seed distinct from the fruit wall

An achene (Greek ἀ, a, privative + χαίνειν, chainein, to gape; also sometimes referred to as akene and occasionally achenium or achenocarp) is a type of simple dry fruit produced by many species of flowering plants. Achenes are monocarpellate (formed from one carpel) and indehiscent (they do not open at maturity). Achenes contain a single seed that nearly fills the pericarp, but does not adhere to it. In many species, what is referred to as the " seed" is actually an achene, a fruit containing the seed. The seed-like appearance is owed to the hardening of the wall of the seed-vessel, which encloses the solitary seed so closely as to seem like an outer coat.