1. a herb whose seeds and thin feathery leaves are used in cooking:

• dill pickles
• 1 tsp fresh dill, chopped

2. an herb whose seeds and leaves are used to flavor foods in cooking

3. Dill (Anethum graveolens) is an annual herb in the celery family Apiaceae. It is the only species in the genus Anethum. Dill is grown widely in Eurasia, where its leaves and seeds are used as a herb or spice for flavouring food.