A ring- or donut-shaped area or structure.
The ring of the sun not covered by the moon in an annular solar eclipse.
Structure in a fern that consists of differentially thick-walled cells on a sporangium that bend and distort as a result of drying.
The region in a plane between two concentric circles of different radii.
The membranous remnants of a partial veil which leaves a ring on the stem of a mushroom.
The space contained between the centre well bore and any external tubing. Sometimes used for separated gas flow.
Any topological space homeomorphic to the region in a plane between two concentric circles of different radius.
That which girds, encircles, or encloses; a circumference
The clitellum of an earthworm.
The line of greatest circumference of a brilliant-cut diamond, at which it is grasped by the setting.
A garment used to hold the abdomen, hips, buttocks, and/or thighs in a particular shape.
A belt or sash at the waist, often used to support stockings or hosiery.
The removal or inversion of a ring of bark in order to kill or stunt a tree.
The zodiac; also, the equator.
A thin bed or stratum of stone.
To gird, encircle, or constrain by such means.
To kill or stunt a tree by removing or inverting a ring of bark.