a link or sleeve with a swivel at one end and an internal screw thread at the other, or with an internal screw thread at each end, used as a means of uniting or coupling, and of tightening, two parts, as the ends of two rods.

1695–1705; turn + buckle

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World English Dictionary
turnbuckle (ˈtɜːnˌbʌkəl)
an open mechanical sleeve usually having a swivel at one end and a thread at the other to enable a threaded wire or rope to be tightened
[C19: from turn + buckle]

Collins English Dictionary - Complete & Unabridged 10th Edition
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Word Origin & History

1703, "catch or fastening for windows and shutters," from turn + buckle. Meaning "coupling with internal screw threads for connecting metal rods" is attested from 1877.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
Turnbuckle or rigging screws shall be of the size and shape shown in the manufacturer's shop drawings.
He landed on his back hitting the top of a turnbuckle on the deck.
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