Annular vs. Annulus

Annularadjective

Pertaining to, or having the form of, a ring; ring-shaped; in the shape of an annulus.

‘annular fiber’;

Annulusnoun

A ring- or donut-shaped area or structure.

Annularadjective

Banded or marked with circles.

Annulusnoun

(geometry) The region in a plane between two concentric circles of different radii.

Annularadjective

Pertaining to, or having the form of, a ring; forming a ring; ringed; ring-shaped; as, annular fibers.

Annulusnoun

(topology) Any topological space homeomorphic to the region in a plane between two concentric circles of different radius.

Annularadjective

Banded or marked with circles.

Annulusnoun

(astronomy) The ring of the sun not covered by the moon in an annular solar eclipse.

Annularadjective

shaped like a ring

Annulusnoun

(botany) Structure in a fern that consists of differentially thick-walled cells on a sporangium that bend and distort as a result of drying.

Annulusnoun

(mycology) The membranous remnants of a partial veil which leaves a ring on the stem of a mushroom.

Annulusnoun

(oil and gas production) The space contained between the centre well bore and any external tubing. Sometimes used for separated gas flow.

Annulusnoun

A ring; a ringlike part or space.

Annulusnoun

A space contained between the circumferences of two circles, one within the other.

Annulusnoun

Ring-shaped structures or markings, found in, or upon, various animals.

Annulusnoun

a toroidal shape;

‘a ring of ships in the harbor’; ‘a halo of smoke’;

Annulusnoun

(Fungi) remnant of the partial veil that in mature mushrooms surrounds the lower part of the stem