"urtication" in the noun sense
1. urtication, urticaria, hives, nettle rash
an itchy skin eruption characterized by weals with pale interiors and well-defined red margins usually the result of an allergic response to insect bites or food or drugs
2. urtication
a sensation of having been stung by nettles
Source: WordNet® (An amazing lexical database of English)
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