pur·lin

[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, pur·line.


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

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World English Dictionary
purlin or purline (ˈpɜːlɪn) [Click for IPA pronunciation guide]
 
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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00:10
Purlin is always a great word to know.
So is lollapalooza. Does it mean:
a printed punctuation mark (‽), available only in some typefaces, designed to combine the question mark (?) and the exclamation point (!), indicating a mixture of query and interjection, as after a rhetorical question.
an extraordinary or unusual thing, person, or event; an exceptional example or instance.
Example sentences
The heavy strapping fastened across the bent will act as jibs for tackle used
  later to raise the purlin and wall plates.
The panels have a purlin bearing leg on the underlap leg of the panel.
He stepped on a purlin, an accepted industry practice, and it completely
  separated from its supporting members at each end.
Compliance with requirements for purlin and rafter conditions, including
  flatness and attachment to structural members.
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