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 rim or margin of something.
In sheet metal design, a rim or edge folded back on itself to create a smooth edge and to increase strength or rigidity.
An utterance or sound of the voice like "hem", often indicative of hesitation or doubt, sometimes used to call attention.
The border of an article of clothing doubled back and stitched together to finish the edge and prevent it from fraying.
Used to fill in the gap of a pause with a vocalized sound.
To shut in, enclose, confine; to surround something or someone in a confining way.
To make the sound expressed by the word hem; to hesitate in speaking.
To make a hem.
To put hem on an article of clothing, to edge or put a border on something.