1. [～菜], an annual or biennial herb with yellow seeds and a pungent flavor, is ground into a powder called "mustard" and used as a condiment. According to the use is divided into leaf mustard (such as "potherb mustard"); stem mustard (such as "squash"); root mustard (such as "big head cabbage").

2. small grass, a metaphor for something slight and slender: grass ~. The fiber ~. ~ boat.

● Mustard gài ◎ [～菜], an annual herb, a variety of mustard, with large leaves, wrinkled surface and prominent veins, is edible. It is also known as "gai cai" (盖菜).