piston ring

from 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
from 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.]
antiflux / dictionary / piston ring
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