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.
Origin: 1545–55; obsolete mayth mayweed (Middle English maithe,Old English mægtha) + weed1
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]