Engineering. A ring or chain which dips into an oil reservoir and continuously lubricates a shaft or bearing around which it revolves. Also: a…

a cock or cup by means of which machinery is supplied with grease.

= grease-cock n.

a form of lubricator in which the supply of lubricant is controlled by a wire fitted in the supply tube and resting on the shaft to be lubricated.

an automatic apparatus for injecting lubricating oil.

a bearing containing a metal ring which rests on and turns with the journal (journal, n. 10), continuously dipping into a reservoir of oil and so…