Putlog definitions

po͝ot'lôg', -lŏg', pŭt'-
One of the short pieces of lumber supporting the floor of a scaffold.
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In masonry construction, any of the horizontal, wood or metal pieces which support the floor planks of a scaffold and which are themselves supported at one end in holes left temporarily in a wall under construction.
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(architecture) One of the short pieces of timber on which the planks forming the floor of a scaffold are laid, one end resting on the ledger of the scaffold, and the other in a hole left in the wall temporarily for the purpose.

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Origin of putlog

Alteration (influenced by log) of obsolete putlock perhaps put lock