Of or relating to auxetic properties or materials; having the characteristic of expanding laterally when stretched.
From 'auxetic' (having unusual expansion properties) + '-al' (pertaining to). A variant form emphasizing the adjectival quality, primarily used in technical materials science literature.
Auxetical foams can absorb sound better than regular foam because their unusual structure converts vibrations into organized motion instead of just dampening them—nature sometimes stumbles onto engineering principles we later exploit.
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