• WordNet 3.6
    • n mayweed widespread rank-smelling weed having white-rayed flower heads with yellow discs
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Webster's Revised Unabridged Dictionary
    • n Mayweed (Bot) 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.
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Century Dictionary and Cyclopedia
    • n mayweed A composite plant, Anthemis Cotula, a common weed throughout Europe and Asiatic Russia, and, by naturalization, in America. It is a branching annual a foot or two high, the leaves finely divided, and the flower-heads having a yellow disk and white rays. The foliage is pungently ill-scented, and is said to blister the hands. It has been used as an emmenagogue and antispasmodic. Other names are dog's-camomile, dog's-fennel, stinking camomile; also Balder-brae, buphthalmum, dillweed. See particularly Anthemis and Cotula.
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In literature:

By this time generally the corn is high above the mayweed, but this year the flower is level with its shelter.
"The Toilers of the Field" by Richard Jefferies
The leaves of the Scentless Mayweed are like many leaves that grow in running water.
"Flowers Shown to the Children" by C. E. Smith