Akene

Part of speech: noun

Definitions

1. A dry, indehiscent fruit that remains closed at maturity and contains one seed within a tough outer layer
2. This type of fruit is usually single-seeded, not splitting open when ripe, and has a hardened shell encasing the seed
3. A dry fruit that does not open at maturity and encloses a single seed inside a hard outer coating

Etymology: The name of this fruit rests on a Greek negative. Ancient Greek "a-" meant "not", and "khaínō" meant "to gape" or "to open wide", so the word literally describes something that does not split open. That is the whole point of the fruit: it stays shut at maturity, so the single seed inside is released only when the outer wall rots or is broken off. The term reached modern scientific writing through New Latin "achena", a botanical coinage built from those Greek parts. It then passed into French as "achène", and English took it from there. Botanists needed a precise label for dry fruits that do not open, and they borrowed the classical building blocks to make one. The spelling "akene" is an alternative form of the same word, following the Latin and Greek letter "k" rather than the French "ch".