urtica : Idioms & Phrases
genus urtica
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noun a nettle yielding fiber resembling flax
Urtica.
WordNet
urtica dioica
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noun perennial Eurasian nettle established in North America having broad coarsely toothed leaves with copious stinging hairs
stinging nettle.
WordNet
urtica pipulifera
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noun annual European nettle with stinging foliage and small clusters of green flowers
Roman nettle.