Dictionary.net

• os-mun'da, n. a genus of ferns, the chief species being OSMUNDA REGALIS, the royal fern--also called Bog-onion, King-fern, &c.

1908 - Chambers's Twentieth Century Dictionary of the English Language
By Thomas Davidson

• Flowering fern.

1916 - Appleton's medical dictionary
By Smith Ely Jelliffe