google
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late 18th century: from Dutch sla, shortened from salade ‘salad’.
wiktionary
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Borrowed (around 1861) from Dutch sla, shortened from salade(“salad, lettuce”). [1] [2]
etymonline
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slaw (n.)
"sliced cabbage," 1794, from Dutch sla, short for salade, from French salade (see salad).
