annular ring n.
An opaque area appearing in radiographs of the lung and indicating a cavity of tuberculosis. Also called pleural ring.
To hold the piston rings or ring in place, a junk ring is employed, being an annular ring bolted to the piston.
The body d is provided with an annular ring fitting into the bore of the base, which is coned at q.
The developments in the form of this brooch show its evolution from a penannular to an annular ring.