"umbelliferous plant with yellow flowers, extensively cultivated for its aroma and oils," Middle English dille, from Old English dile "dill, anise," a Germanic word of unknown origin (cognates: Old Saxon dilli, Middle Dutch and Dutch dille, Swedish dill, German Dill). Dill-pickle is recorded from 1899.
dilemma
dilettante
dilettantism
diligence
diligent
dill
dilly
dilly-dally
dilute
dilution
diluvial