scentless camomile: ubiquitous European annual weed with white flowers and finely divided leaves naturalized and sometimes cultivated in eastern North America; sometimes included in genus Matricaria
herb: a plant lacking a permanent woody stem; many are flowering garden plants or potherbs; some having medicinal properties; some are pests
strange quark: a quark with an electric charge of -1/3 and a mass 988 times that of an electron and a strangeness of -1