| Noun | 1. corn mayweed - ubiquitous European annual weed with white flowers and finely divided leaves naturalized and sometimes cultivated in eastern North America; sometimes included in genus MatricariaMatricaria inodorum, scentless camomile, scentless false camomile, scentless hayweed, scentless mayweed, Tripleurospermum inodorumgenus Tripleurospermum, Tripleurospermum - small genus comprising plants often included in genus Matricariaherb, herbaceous plant - a plant lacking a permanent woody stem; many are flowering garden plants or potherbs; some having medicinal properties; some are pests | | 2. corn mayweed - European white-flowered weed naturalized in North AmericaAnthemis arvensis, corn chamomile, field chamomilecomposite plant, composite - considered the most highly evolved dicotyledonous plants, characterized by florets arranged in dense heads that resemble single flowersAnthemis, genus Anthemis - dog fennel |