Definitions

from The American Heritage® Dictionary of the English Language, 4th Edition

  • n. A small, dry, indehiscent one-seeded fruit with a thin wall, as in the sunflower.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. A small, dry, indehiscent fruit, containing a single seed, as in the buttercup; -- called a naked seed by the earlier botanists

from the GNU version of the Collaborative International Dictionary of English

  • n. A small, dry, indehiscent fruit, containing a single seed, as in the buttercup; -- called a naked seed by the earlier botanists.

from The Century Dictionary and Cyclopedia

  • n. English form of achenium. Also spelled akene.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

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

Etymologies

New Latin achēnium : Greek a-, without; see a-1 + Greek khainein, to yawn.
(American Heritage® Dictionary of the English Language, Fourth Edition)
From French akène and its source, Latin achena, from Ancient Greek ἀ- ("a-") + χαίνω (chainō, "to gape"). (Wiktionary)

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