Source : Webster's Revised Unabridged Dictionary (1913)

Moonwort \Moon"wort`\, n. (Bot.)
      (a) The herb lunary or honesty. See {Honesty}.
      (b) Any fern of the genus {Botrychium}, esp. {B. Lunaria};
          -- so named from the crescent-shaped segments of its
          frond.