noun.
A herb of the genus Urtica, which is covered with stinging, mildly poisonous hairs, causing an instant rash.
noun.
The non-stinging plant deadnettle, also in the nettle family, Urticaceae.
noun.
Loosely, anything which causes a similarly stinging rash, such as a jellyfish or sea-nettle.
verb.
Of the nettle plant and similar physical causes, to sting causing a rash in someone.
verb.
To pique, irritate, vex or provoke someone.