A surgical instrument or muscle that pulls tissue back to expose an area during an operation or medical procedure.
From Latin 'retractus' (pulled back) + agent suffix '-or'. The prefix 're-' means back, and 'tractus' comes from 'trahere' (to pull). The term became common in medical English in the 1800s as surgical techniques advanced.
Surgeons use retractors to literally hold body parts out of the way—it's like using bookends to keep pages open so you can see what's underneath. The same root 'tract' appears in 'tractor' (which pulls) and 'attract' (which pulls toward), showing how Latin gave us a whole family of 'pulling' words.
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