Plural of deltoid; multiple kite-shaped curves, quadrilaterals, or more commonly, the shoulder muscles.
From 'deltoid' + plural '-s' ending. The basic English plural of the Greek-origin term.
When bodybuilders talk about 'traps' and 'delts,' they're using gym slang for trapezius and deltoid muscles—your shoulder strength relies on these three-part muscles working in perfect coordination!
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