Tripleurospermum inodorum n 1: ubiquitous European annual weed with white flowers and finely divided leaves naturalized and sometimes cultivated in eastern North America; sometimes included in genus Matricaria [syn: {scentless camomile}, {scentless false camomile}, {scentless mayweed}, {scentless hayweed}, {corn mayweed}, {Tripleurospermum inodorum}, {Matricaria inodorum}]