a composite plant, Anthemis cotula, native to Europe and Asia but naturalized in North America, having pungent, rank-smelling foliage and flower heads with a yellow disk and white rays.

1545–55; obsolete mayth mayweed (Middle English maithe, Old English mægtha) + weed1 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
mayweed (ˈmeɪˌwiːd)
1.  dog fennel, Also called: stinking mayweed a widespread Eurasian weedy plant, Anthemis cotula, having evil-smelling leaves and daisy-like flower heads: family Asteraceae (composites)
2.  scentless mayweed a similar and related plant, Matricaria maritima, with scentless leaves
[C16: changed from Old English mægtha mayweed + weed1]

Collins English Dictionary - Complete & Unabridged 10th Edition
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Example sentences
The common chamomile and the scentless mayweed revisited.
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