What does "achene" mean?

A small, dry, indehiscent fruit, containing a single seed, as in the buttercup.

Achene

Common synonyms include: dandelion seed, dry fruit, indehiscent fruit, seed unit, seed-bearing unit, single seeded fruit.

/əˈkiːn/ noun

noun ·Rare ·Advanced level

Noun

1
A small, dry, indehiscent fruit, containing a single seed, as in the buttercup.
"The mulberry puts forth its messy clusters of achenes."
2
small dry indehiscent fruit with the seed distinct from the fruit wall wordnet

"The mulberry puts forth its messy clusters of achenes."

From French achène and its source, New Latin achena, from Ancient Greek ἀ- (a-, “a-”) + χαίνω (khaínō, “to gape”).