'Mayweed' definitions:

Definition of 'mayweed'

noun

Widespread rank-smelling weed having white-rayed flower heads with yellow discs [syn: mayweed, dog fennel, stinking mayweed, stinking chamomile, Anthemis cotula]

From: GCIDE

Mayweed \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. [1913 Webster] Mazama

From: GCIDE

Fennel \Fen"nel\ (f[e^]n"n[e^]l), n. [AS. fenol, finol, from L. feniculum, faeniculum, dim. of fenum, faenum, hay: cf. F. fenouil. Cf. Fenugreek. Finochio.] (Bot.) A perennial plant of the genus F[ae]niculum ({F[ae]niculum vulgare}), having very finely divided leaves. It is cultivated in gardens for the agreeable aromatic flavor of its seeds. [1913 Webster]
Smell of sweetest fennel. --Milton. [1913 Webster]
A sprig of fennel was in fact the theological smelling bottle of the tender sex. --S. G. Goodrich. [1913 Webster]
Azorean fennel, or Sweet fennel, (F[ae]niculum dulce). It is a smaller and stouter plant than the common fennel, and is used as a pot herb.
Dog's fennel (Anthemis Cotula), a foul-smelling European weed; -- called also mayweed.
Fennel flower (Bot.), an herb (Nigella) of the Buttercup family, having leaves finely divided, like those of the fennel. Nigella Damascena is common in gardens. {Nigella sativa} furnishes the fennel seed, used as a condiment, etc., in India. These seeds are the "fitches" mentioned in Isaiah (xxviii. 25).
Fennel water (Med.), the distilled water of fennel seed. It is stimulant and carminative.
Giant fennel (Ferula communis), has stems full of pith, which, it is said, were used to carry fire, first, by Prometheus.
Hog's fennel, a European plant (Peucedanum officinale) looking something like fennel. [1913 Webster]