Source : WordNet®

scentless hayweed
     n : 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}, {corn mayweed}, {Tripleurospermum
         inodorum}, {Matricaria inodorum}]