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.
may·weed (mā'wēd') n. A widespread weed (Anthemis cotula) having rank-smelling, bipinnately divided leaves and white-rayed flower heads. Also called stinking chamomile.
[Middle English maythe weed, mayyen wed, alteration (influenced by May and maiden) of maithe, from Old English mægtha.]