The Collaborative International Dictionary of English v.0.48:

Hosta \Hosta\ prop. n.
   A genus of robust East Asian clump-forming perennial herbs
   having racemose flowers: plantain lilies; sometimes placed in
   the family Hostaceae.

   Syn: genus Hosta, Funka, genus Funka.
        [WordNet 1.5]

WordNet (r) 3.0 (2006):

Hosta
    n 1: robust east Asian clump-forming perennial herbs having
         racemose flowers: plantain lilies; sometimes placed in
         family Hostaceae [syn: Hosta, genus Hosta, Funka,
         genus Funka]