May·weed n. Bot. (a) A composite plant (Anthemis Cotula), having a strong odor; dog's fennel.  It is a native of Europe, now common by the roadsides in the United States. (b) The feverfew.
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  mayweed
       n : widespread rank-smelling weed having white-rayed flower
           heads with yellow discs [syn: dog fennel, stinking
           mayweed, stinking chamomile, Anthemis cotula]