Basic Guidelines For English Spellings
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The root of the horseradish, Armoracia rusticana; the plant itself. Also (in later use chiefly Scottish): radish, Raphanus sativus.
Mid 16th century; earliest use found in Robert Copland (fl. 1505–1547), translator and printer. From Middle French raifort, rayffort, riffort, rifort, etc. from raiz root + fort strong.