1. 
   knuckle joint
   [n] - a joint allowing movement in one plane only
   Found op http://www.webdictionary.co.uk/definition.php?query=knuckle%20joint
   
   
2. 
   knuckle joint
   Interlocking joint of wood used as a hinge on the brackets of drop-leaf tables.
   Found op http://www.encyclo.co.uk/visitor-contributions.php
   
   
3. 
   knuckle joint
   hinge joint noun a joint allowing movement in one plane only
   Found op http://wordnetweb.princeton.edu/perl/webwn?s=knuckle%20joint
   
   
4. 
   Knuckle joint
   [mechanical] A knuckle joint is used to connect the two rods which are under the tensile load, when there is requirement of small amount of flexibility or angular moment is necessary. There is always axial or linear line of action of load. ...
   Found op http://en.wikipedia.org/wiki/Knuckle_joint_(mechanical)
   
   
5. 
   knuckle-joint
   Interlocking joint of wood used as a hinge on the brackets of drop-leaf tables.
   Found op http://www.antique-marks.com/antique-terms-k.html
   
   

Tip: double click on a word to show its meaning.