Designed to resist or prevent friction; not easily affected by rubbing or sliding surfaces.
A compound of 'friction' (from Latin 'frictio', meaning rubbing) and 'proof' (from Old French 'proeuve', meaning test or evidence). The 'proof' suffix evolved to mean 'resistant to' or 'protected against' something undesirable.
This word emerged during the Industrial Revolution when engineers desperately needed materials that could withstand constant mechanical wear—frictionproof coatings became crucial for early machinery and still matter today in everything from skateboard bearings to surgical instruments.
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