noun. an oblong metal coupling with a swivel at one end and an internal thread at the other into which a threaded rod can be screwed in order to form a unit that can be adjusted for length or tension.
1. Noun, singular or mass Replace your drill bit with the spade bit and place the wide part of the spade bit through the middle opening of the turnbuckle. 2. Adjective Find the measurement that matches the end measurement on a turnbuckle size chart to know the load capacity.