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Medieval History Term of the Week: Joist

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Etymology: Middle English giste, joiste, from Anglo-French giste, from Vulgar Latin *jacitum, from Latin jac?re to lie

One of parallel timbers stretched from wall to wall, to support the floor-boards. Laid flat earlier, from the later 17th century laid on edge.
(Wood, Margaret. The English Medieval House, 412)

*term definitions retrieved from Netserf’s Medieval Glossary (