noun Pathology.
a transient condition of the skin, usually caused by an allergic reaction, characterized by pale or reddened irregular, elevated patches and severe itching; hives.

1765–75; < Neo-Latin, equivalent to Latin urtīc(a) nettle + -āria, feminine of -ārius -ary

urticarial, adjective
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World English Dictionary
urticaria (ˌɜːtɪˈkɛərɪə)
hives, Nontechnical names: nettle rash a skin condition characterized by the formation of itchy red or whitish raised patches, usually caused by an allergy
[C18: from New Latin, from Latin urtīca nettle]

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American Heritage
Medical Dictionary

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.

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Science Dictionary
urticaria   (ûr'tĭ-kâr'ē-ə)  Pronunciation Key 
See hives.
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