Search Result for "piston ring":
Wordnet 3.0

NOUN (1)

1. seal consisting of a split metal ring that seals the gap between a piston and the cylinder wall; 



The Collaborative International Dictionary of English v.0.48:

Piston ring \Pis"ton ring\ (Mach.)
   A spring packing ring, or any of several such rings, for a
   piston.
   [Webster 1913 Suppl.]


WordNet (r) 3.0 (2006):

piston ring
    n 1: seal consisting of a split metal ring that seals the gap
         between a piston and the cylinder wall