purlin

[pur-lin]
noun
a longitudinal member in a roof frame, usually for supporting common rafters or the like between the plate and the ridge.
Also, purline.


Origin:
1400–50; late Middle English purlyn, purloyne, akin to Anglo-Latin perliō; of uncertain origin

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
purlin or purline (ˈpɜːlɪn)
 
n
a horizontal beam that provides intermediate support for the common rafters of a roof construction
 
[C15: of uncertain origin]
 
purline or purline
 
n
 
[C15: of uncertain origin]

Collins English Dictionary - Complete & Unabridged 10th Edition
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Example sentences
The panels have a purlin bearing leg on the underlap leg of the panel.
The fasteners shall be located at each steel purlin.
He stepped on a purlin, an accepted industry practice, and it completely
  separated from its supporting members at each end.
The heavy strapping fastened across the bent will act as jibs for tackle used
  later to raise the purlin and wall plates.
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