D defs.my
Entry 1 sense Webster, 1913

Achene

/ək-ēn'/ · A·chene · IPA /əˈkiːn/
01 n. A small, dry, indehiscent fruit, containing a single seed, as in the buttercup; -- called a naked seed by the earlier botanists.
  1. 1.
    A small, dry, indehiscent fruit, containing a single seed, as in the buttercup; -- called a naked seed by the earlier botanists.(Bot.) Also: naked seed