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medical Latin, from Latin urtica "nettle," from urere "to burn." The native name is nettle-rash.
urticaria ur·ti·car·i·a (ûr'tĭ-kâr'ē-ə)
A skin condition characterized by welts that itch intensely, caused by an allergic reaction, an infection, or a nervous condition. Also called hives, nettle rash.
urticarial ur·ti·car·i·al (ûr'tĭ-kâr'ē-əl)
Relating to or marked by urticaria.