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The Collaborative International Dictionary
Interjoist

Interjoist \In"ter*joist`\, n. (Carp.)

  1. The space or interval between two joists.
    --Gwilt.

  2. A middle joist or crossbeam.
    --De Colange.

Wiktionary
interjoist

n. 1 (context carpentry English) The space or interval between two joists. 2 (context carpentry English) A middle joist or crossbeam.