Etymology
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abs (n.)

colloquial shortening of abdominals, by 1992.

updated on August 11, 2018

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Definitions of abs from WordNet

abs (n.)
any of a class of composite plastics used to make car bodies and cases for computers and other appliances;
Synonyms: acrylonitrile-butadiene-styrene
From wordnet.princeton.edu, not affiliated with etymonline.