From WordNet (r) 3.0 (2006):
nettle
n 1: any of numerous plants having stinging hairs that cause
skin irritation on contact (especially of the genus Urtica
or family Urticaceae)
v 1: sting with or as with nettles and cause a stinging pain or
sensation [syn: nettle, urticate]
2: cause annoyance in; disturb, especially by minor irritations;
"Mosquitoes buzzing in my ear really bothers me"; "It
irritates me that she never closes the door after she leaves"
[syn: annoy, rag, get to, bother, get at,
irritate, rile, nark, nettle, gravel, vex,
chafe, devil]