(n) chiefly Old World strong-smelling weedy herbs; comprises plants sometimes included in other genera: e.g. Tanacetum; Tripleurospermum, Syn. genus Matricaria
(n) annual aromatic weed of Pacific coastal areas (United States and northeastern Asia) having bristle-pointed leaves and rayless yellow flowers, Syn. rayless chamomile, Matricaria matricarioides
prop. n. A genus of chiefly Old World strong-smelling weedy herbs; it comprises plants sometimes included in other genera, such as Tanacetum and Tripleurospermum. Syn. -- genus Matricaria. [ WordNet 1.5 ]