One of the mysteries of the English language finally explained.
A threaded pin or rod; specifically (a) one used to adjust the position of something, as in a vice (also figurative); (b) one used to fix something in position or join things together; (c) one used to hold parts of a fractured bone in position.
Late 16th century; earliest use found in John Blagrave (d. 1611), mathematician. From screw + pin.
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