c. 1500, from raysyn of Curans (mid-14c.) "raisins of Corinth," with the -s- mistaken for a plural inflection. From Anglo-French reisin de Corauntz. The small, seedless raisins were exported from southern Greece. Then in 1570s the word was applied to an unrelated Northern European berry (genus Ribes), recently introduced in England, on its resemblance to the raisins.
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