ur·ti·ca·tion \ˌ ̷ ̷ ̷ ̷ˈkāshən\noun (-s) Etymology: Medieval Latin urtication-, urticatio, from urticatus (past participle) + Latin -ion-, -io -ion 1.: an itching and stinging sensation (as from contact with nettles) 2.[urtic- (in New Latin urticaria) + -ation]: wheal formation in urticaria