hairpin

(-pin′)

noun

a small, usually -shaped, piece of wire, shell, etc., for keeping the hair or a headdress in place

adjective

formed like a hairpin: a hairpin turn

See hairpin in American Heritage Dictionary 4

noun
  1. A thin cylindrical strip of metal or other material bent in the shape of a long U, used to secure a hairdo or headdress.
  2. Something shaped like a hairpin, especially a sharp turn in a road.

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