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What is the origin of the word horseradish?

Question
What is the origin of the word horseradish?

Answer

It’s an Old English word that appears in 16th-century records, although it probably was used long before then. Horse was often used as a prefix in the names of plants to denote a large, strong, coarse kind. The horseradish root is very large and pungent, especially when compared to the ordinary radish.