expansion joint

noun
a joint between two parts of a structure, machine, etc., permitting expansion, as from heat, without structural damage.

Origin:
1840–50

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2013.
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World English Dictionary
expansion joint
 
n
engineering a gap in steel or concrete to allow for thermal expansion

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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00:10
Expansion joint is always a great word to know.
So is ninnyhammer. Does it mean:
a calculus or concretion found in the stomach or intestines of certain animals, esp. ruminants, formerly reputed to be an effective remedy for poison.
a fool or simpleton; ninny.
Example sentences
Any grout that flows into an expansion joint shall be flushed from the expansion joint immediately.
The bridge rail sections at the bridge deck expansion joint were adjusted.
The anchors are cast into the joint panels on either side of the expansion joint.
In end spans, the closure joint is usually nearer to the end expansion joint.
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