Definition of hieracium
1 capitalized : a very large and nearly cosmopolitan genus of weedy perennial herbs (family Compositae) having simple often basal leaves and heads of yellow or reddish orange ray flowers — see orange hawkweed
2 plural hieracia or hieraciums : any plant of the genus Hieracium
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Origin and Etymology of hieracium
New Latin, from Greek hierakion hawkweed, from hierak-, hierax hawk, from hienai to hurry
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