noun
Usage: usually capitalized J
: a coarse annual grass with thick appressed purplish inflorescence and awnless spikelets that is considered to be a variety of barnyard grass or a distinct species ( Echinochloa frumentacea ), is cultivated especially in Japan and southeastern Asia for its edible seeds which resemble millet and for forage, and is an important wildlife food in parts of the U.S. — called also billion-dollar grass, Japanese barnyard millet, sanwa millet