n. (Mech.) (a) A loop or sleeve with a screw thread at one end and a swivel at the other, -- used for tightening a rod, stay, etc. (b) A gravitating catch, as for fastening a shutter, the end of a chain, or a hasp. [ 1913 Webster ]
(n) 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