leaf vegetable; green vegetable; edible herb
Refers to vegetables where the leaves are the main edible part, such as spinach, lettuce, and komatsuna. Often used in cooking and nutrition contexts.
See also: 葉菜
Leaf vegetables are rich in vitamins.
I made a salad with leafy greens for dinner tonight.
葉菜 is a more technical or categorical term for leaf vegetables, while 葉物野菜 is a common, everyday word.
Compound of 葉物 (leafy thing) + 野菜 (vegetable). The exact historical derivation is uncertain, but the word transparently means 'leafy vegetable'.