ur·ti·cariaBrE /ˌɜːtɪˈkeəriə/ 🔊NAmE /ˌɜːrtɪˈkeriə/ 🔊 (also nettle·rash, hives) noun [uncountable] (medical 医学) red spots on the skin that itch, caused by an allergic (= make you want to scratch), caused by an allergic reaction, for example to certain foods 荨麻疹