(dated UK) A unit of length equal to one-thousandth of an inch.
Origin of Thou
From Middle English thou, thow, thu, þou, from Old English þū, from Proto-Germanic *þū, from Proto-Indo-European *túhâ‚‚. Akin to Old Frisian thÅ« (West Frisian do), Old Saxon thÅ« (Low German du), Old Dutch thÅ« (Middle Dutch du, Limburgish doe), Old High German dÅ« (German du), Old Norse þú, (Icelandic þú, Danish du, Norwegian du, Swedish du), Latin tu, Ancient Greek σύ (sý) (Modern Greek εσύ (esý)).
Middle English from Old English thū second person nominative sing. personal pron. tu- in Indo-European roots
From American Heritage Dictionary of the English Language, 5th Edition
Shortened from thousandth.
Shortened from thousand.
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