Barrenwort n. : An herbaceous plant of the Barberry family (Epimedium alpinum), having leaves that are bitter and said to be sudorific.

Example:
what is Barrenwort?

Taxonomy
Epimedium, icariin, species, flower, PDE-5, cultivation, micromolar, sepals, varieties, penile, weed, free encyclopedia, Chinese species, genus Epimedium, sildenafil, plants, foliage, in vitro.

Defination from the web:
Barrenwort) Jump to: navigation, search. Epimedium. Epimedium grandiflorum ... Epimedium, also known as Rowdy Lamb Herb, Barrenwort, Bishop's Hat, Fairy Wings, Horny Goat Weed, or Yin Yang Huo (Chinese: 淫羊藿), is a genus of ...