n. the deltoid muscles. (Bodybuilding.) : Look at the delts on that dame!
Dictionary of American Slang and Colloquial Expressions by Richard A. Spears.Fourth Edition. Copyright 2007. Published by McGraw Hill.
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Medical Dictionary
Main Entry: delt Pronunciation: 'delt Function: noun :DELTOID —usually usedin plural
Main Entry: delts Pronunciation: 'delts plural ofDELT