ACHENE
achene
(noun) small dry indehiscent fruit with the seed distinct from the fruit wall
Source: WordNet® 3.1
Etymology
Noun
achene (plural achenes)
(botany) A small, dry, indehiscent fruit, containing a single seed, as in the buttercup.
Usage notes
Early botanists referred to achenes as naked seeds.
Source: Wiktionary
A*chene", A*che"ni*um n. Etym: [Gr. (Bot.)
Definition: 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 achænium.]
Source: Webster’s Unabridged Dictionary 1913 Edition