2 definitions
for Urtica
From The Collaborative International Dictionary of English v.0.48 :
Urtica \Ur*ti"ca\, n. [L., a nettle.] (Bot.)
A genus of plants including the common nettles. See Nettle,
n.
[1913 Webster]
From WordNet (r) 2.0 :
Urtica
n : a nettle yielding fiber resembling flax [syn: genus Urtica]