Scaffold Definition
(metalworking) An accumulation of adherent, partly fused material forming a shelf or dome-shaped obstruction above the tuyeres in a blast furnace.
Origin of Scaffold
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Middle English scaffold, scaffalde, from Medieval Latin scaffaldus, from Old French eschaffaut, escadafaut (“platform to see a tournament"), from Late Latin scadafaltum, from ex- + *cadafaltum, catafalcum (“view-stage"), from Old Italian *catare (“to view, see") + falco (“a stage"), a variant of balco (“stage, beam, balk"), from Lombardic palko, palcho (“scaffold, balk, beam"), from Proto-Germanic *balkô (“beam, rafter"), from Proto-Indo-European *bhelg- (“beam, plank"). Akin to Old High German balco, balcho (“scaffold, balk, beam"). More at catafalque, balcony, balk.
From Wiktionary
Middle English from Medieval Latin scaffaldus of Old French origin
From American Heritage Dictionary of the English Language, 5th Edition
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