nettle
     n : 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: {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}, {gravel}, {vex}, {chafe},
         {devil}]
Source: WordNet® 2.0