Chinese cabbage

noun
1.
a plant, Brassica rapa pekinensis, forming a long, dense head of broad, whitish leaves used in salads and Oriental cuisine.
Also called celery cabbage, Chinese celery, napa, pe-tsai.
Origin
1835-45, Americanism
British Dictionary definitions for Chinese cabbage

Chinese cabbage

noun
1.
Also called pe-tsai cabbage. a Chinese plant, Brassica pekinensis, that is related to the cabbage and has crisp edible leaves growing in a loose cylindrical head
2.
another name for bok choy