Definition of urticaria noun from the Oxford Advanced Learner's Dictionary

 

urticaria

 noun
noun
BrE BrE//ˌɜːtɪˈkeəriə//
 
; NAmE NAmE//ˌɜːrtɪˈkeriə//
 
(also nettlerash, hives)[uncountable](medical)
 
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red spots on the skin that itch (= make you want to scratch), caused by an allergic reaction, for example to certain foods Word Origin late 18th cent.: modern Latin, from Latin urtica ‘nettle’, from urere ‘to burn’.
See the Oxford Advanced American Dictionary entry: urticaria