Capable of being drawn back, withdrawn, or folded away when not in use.
From Latin 'retractus,' past participle of 'retrahere' meaning 'to draw back.' Combines 're-' (back) with 'trahere' (to draw, drag).
The concept of retractable design mimics nature - like a cat's claws or a snail's tentacles. Engineers often study these biological models when designing retractable mechanisms for everything from landing gear to stadium roofs.
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