Watercress (noun)

A perennial aquatic or marshy plant, Nasturtium officinale, with pungent-tasting leaves that are used in salads and sandwiches.

Origin:

Late middle english: from water + cress.

Examples:

1. Watercress is a delicious addition to sandwiches and salads.
2. Watercress is a rich source of vitamin K, vitamin C, and Vitamin A.
3. The watercress soup is a traditional dish in many parts of the world.
4. Watercress is also used in traditional medicine as a diuretic, laxative and as a treatment for scurvy.
5. I'm adding some watercress to my salad to give it a bit of a kick.