| Noun | 1. | leaf mustard - Asiatic mustard used as a potherb Brassica, genus Brassica - mustards: cabbages; cauliflowers; turnips; etc. mustard - any of several cruciferous plants of the genus Brassica |
| 2. | leaf mustard - leaves eaten as cooked greens cruciferous vegetable - a vegetable of the mustard family: especially mustard greens; various cabbages; broccoli; cauliflower; brussels sprouts |