The story
From an Anglo-Norman or Middle English form ditaundere attested in a glossary ca. 1265 and by an obscure reason extended from the word underlying dittany.
Etymology from Wiktionary, CC BY-SA 4.0.
dittander
Today it means: A peppergrass of species Lepidium latifolium, native from Iberia to the Himalayas, introduced elsewhere. Full definition →