Structure in a fern that consists of differentially thick-walled cells on a sporangium that bend and distort as a result of drying.
The ring of the sun not covered by the moon in an annular solar eclipse.
A ring- or donut-shaped area or structure.
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 flexible band partly or wholly encircling the spore cases of ferns.
A family of sets that is closed under finite unions and differences.
A circumscribing object, (roughly) circular and hollow, looking like an annual ring, earring, finger ring etc.
An exclusive group of people, usually involving some unethical or illegal practices.
An old English measure of corn equal to the coomb or half a quarter.
A large circular prehistoric stone construction such as Stonehenge.
A group of atoms linked by bonds to form a closed chain in a molecule.
A piece of food in the shape of a ring.
Any loud sound; the sound of numerous voices; a sound continued, repeated, or reverberated.
A circular group of people or objects.
A sound or appearance that is characteristic of something.
A bird band, a round piece of metal put around a bird's leg used for identification and studies of migration.
A planar geometrical figure included between two concentric circles.
A chime, or set of bells harmonically tuned.
The resonant sound of a bell, or a sound resembling it.
A formation of various pieces of material orbiting around a planet or young star.
The open space in front of a racecourse stand, used for betting purposes.
The twenty-fifth Lenormand card.
A pleasant or correct sound.
An algebraic structure which consists of a set with two binary operations: an additive operation and a multiplicative operation, such that the set is an abelian group under the additive operation, a monoid under the multiplicative operation, and such that the multiplicative operation is distributive with respect to the additive operation.
A diacritical mark in the shape of a hollow circle placed above or under the letter; a kroužek.
In a jack plug, the connector between the tip and the sleeve.
A round piece of (precious) metal worn around the finger or through the ear, nose, etc.
A place where some sports or exhibitions take place; notably a circular or comparable arena, such as a boxing ring or a circus ring; hence the field of a political contest.
Either of the pair of clamps used to hold a telescopic sight to a rifle.
A hierarchical level of privilege in a computer system, usually at hardware level, used to protect data and functionality (also protection ring).
An algebraic structure as above, but only required to be a semigroup under the multiplicative operation, that is, there need not be a multiplicative identity element.
A telephone call.
A burner on a kitchen stove.
An instrument, formerly used for taking the sun's altitude, consisting of a brass ring suspended by a swivel, with a hole at one side through which a solar ray entering indicated the altitude on the graduated inner surface opposite.
To produce (a sound) by ringing.
To produce the sound of a bell or a similar sound.
To telephone (someone).
To steal and change the identity of (cars) in order to resell them.
To make (a bell, etc.) produce a resonant sound.
To ride around (a group of animals, especially catle) to keep them milling in one place; hence (intransitive), to work as a drover, to muster cattle.
to resound, reverberate, echo.
Of a bell, etc., to produce a resonant sound.
Of something spoken or written, to appear to be, to seem, to sound.
To surround or fit with a ring, or as if with a ring.
To produce music with bells.
To enclose or surround.
To attach a ring to, especially for identification.
To make an incision around; to girdle; to cut away a circular tract of bark from a tree in order to kill it.
To rise in the air spirally.