interflashing

flashing

[flash-ing]
noun
1.
Building Trades. pieces of sheet metal or the like used to cover and protect certain joints and angles, as where a roof comes in contact with a wall or chimney, especially against leakage.
2.
the act of creating an artificial flood in a conduit or stream, as in a sewer for cleansing it.
3.
Photography, Movies. the process of increasing film speed by exposing undeveloped film briefly to a weak light source before using it or of exposing photographic printing paper to reduce contrast.

Origin:
1775–85; flash + -ing1

interflashing, noun
unflashing, adjective
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Collins
World English Dictionary
flashing (ˈflæʃɪŋ)
 
n
a weatherproof material, esp thin sheet metal, used to cover the valleys between the slopes of a roof, the junction between a chimney and a roof, etc

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Etymonline
Word Origin & History

flashing
1570s, of light; see flash. Meaning indecent exposure is from 1896. The meaning strip of metal used in roofing, etc. is from 1782, earlier simply flash (1570s), but is of unknown origin and might be an unrelated word.
Online Etymology Dictionary, © 2010 Douglas Harper
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