Containing the property of counter-intuitively expanding when being stretched.(adjective)
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Use "auxetic" in a sentence
"Already noted for its pioneering auxetic bandages, which remarkably grow thicker when you stretch them, the local university has now invented a cloth which produces its own power."
"Patents have already been granted to the team led by Professor Elias Siores at Bolton University, where auxetic materials were pioneered by another group led by Dr Kim Alderson."
"This video .mov format from Bolton University, UK, shows an auxetic foam in action."