Etymology

Middlesex

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Today it means: A former inland county of England, partly absorbed into the erstwhile County of London in 1889; finally abolished in 1965 and absorbed mainly into Greater London, the south-west corner of the county becoming Spelthorne Borough and included in Surrey. The whole county, in whatever form, had the Thames as its southern boundary. Full definition →

Old English Middelseaxan
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The story

  1. Old English · inherited fromMiddelseaxan
  2. English todayMiddlesex

From Old English Middelseaxan (literally “Middle Saxons”), which stood for both Middlesex and its people.

Etymology from Wiktionary, CC BY-SA 4.0.