A gasket or seal in the form of a ring with a circular cross section, typically made of rubber and used especially in swivelling joints.
- I came across far too many dodgy cylinder O-rings in the short time we were there.
- In lieu of an O-ring of gasket, the part to be sealed is assembled prior to the injection of the material.
- The commission concluded that the disaster was caused by the failure of a rubber O-ring in a joint in one of the SRBs.
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