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put·log(po͝ot′lôg′, -lŏg′, pŭt′-)
One of the short pieces of lumber supporting the floor of a scaffold.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
(Building) a short horizontal beam that with others supports the floor planks of a scaffold
[C17: changed (through influence of log1) from earlier putlock, probably from put (past participle) +lock1]
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014