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

 

groundsel

 noun
noun
BrE BrE//ˈɡraʊnsl//
 
; NAmE NAmE//ˈɡraʊnsl//
 
[uncountable]
 
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a wild plant with yellow flowers, sometimes used as food for animals and birds Word Origin Old English gundæswelgiæ (later grundeswylige), probably from gund ‘pus’ + swelgan ‘to swallow’ (with reference to its use in poultices). The later form may be by association with ground, and refer to the plant's rapid growth.
See the Oxford Advanced American Dictionary entry: groundsel