mustard
/ˈmʌstəd; `mʌstɚd/ n
1 [U] plant with yellow flowers and (black or white) sharp-tasting seeds in long thin pods 芥.
2
(a) [U] (also `mustard powder) these seeds ground into powder 芥末.
(b) [U, C] these seeds or this powder mixed into a strong-flavoured sauce with (esp) vinegar and served with savoury food 芥子酱
[attrib 作定语]
a mustard pot/jar/spoon 芥末瓶[罐/勺].
3 [U] darkish yellow colour (like the sauce made from the seeds of the mustard plant) 芥末黄; 深黄色
[attrib 作定语]
a mustard (yellow) sweater 芥末黄（深黄色）毛衣.
4 (idm 习语) keen as mustard => keen1.