NETTLE

noun

1. Any plant whose foliage is covered with stinging, mildly poisonous hairs, causing an instant rash.
2. Certain plants that have spines or prickles:
3. Certain non-stinging plants, mostly in the family Lamiaceae, that resemble the species of Urtica:

verb

1. Of the nettle plant and similar physical causes, to sting, causing a rash in someone.
2. To pique, irritate, vex or provoke.