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.
A ring; a circular band; anything resembling a hoop.
The hoopoe.
A circular band of metal used to bind a barrel.
A horizontal stripe on the jersey.
A circle, or combination of circles, of thin whalebone, metal, or other elastic material, used for expanding the skirts of ladies' dresses; (hence, by extension) a hoop petticoat or hoop skirt.
A quart pot; so called because originally bound with hoops, like a barrel. Also, a portion of the contents measured by the distance between the hoops.
The game of basketball.
The rim part of a basketball net.
A circular band of metal, wood, or similar material used for forming part of a framework such as an awning or tent.
A jockey.
A hoop earring.
An obstacle that must be overcome in order to proceed.
A shout; a whoop, as in whooping cough.
To bind or fasten using a hoop.
To clasp; to encircle; to surround.