Real Dictionary

dill
uncountable noun: Dill is a herb with yellow flowers and a strong sweet smell.

dill in American English
any of a genus (Anethum) of plants of the umbel family, esp. a European herb (A. graveolens) with bitter seeds and aromatic leaves, used to flavor pickles, soups, etc.
noun: a plant, Anethum graveolens, of the parsley family, having aromatic seeds and finely divided leaves, both of which are used for flavoring food

dill in British English 1
noun: an umbelliferous aromatic Eurasian plant, Anethum graveolens, with finely dissected leaves and umbrella-shaped clusters of yellow flowers

dill in British English 2
noun: a foolish person