bok choy n 1: Asiatic plant grown for its cluster of edible white stalks with dark green leaves [syn: {bok choy}, {bok choi}, {pakchoi}, {pak choi}, {Chinese white cabbage}, {Brassica rapa chinensis}] 2: elongated head of dark green leaves on thick white stalks [syn: {bok choy}, {bok choi}]