Webster's English Dictionary

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urticaria

ur.ti.car.ia \.*rt-*-'kar-e--*, -'ker-\ \-e--*l\ n [NL, fr. L urtica 
   nettle] : an allergic disorder marked by raised edematous patches of skin 
   or mucou s membrane and usu. intense itching and caused by contact with a 
   specific precipitating factor either externally or internally (as by a 
   food, drug, or inhalant) - ur.ti.car.i.al aj