Associations to the word «Annulus»

ANNULUS, noun. A ring- or donut-shaped area or structure.

ANNULUS, noun. (geometry) The region in a plane between two concentric circles of different radius.

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

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

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

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

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

ANNULUS FIBROSUS, noun. Annulus fibrosus cordis

ANNULUS FIBROSUS, noun. Annulus fibrosus disci intervertebralis

ANNULUS FIBROSUS, noun. Annulus fibrosus tympani

ANNULUS OF ZINN, noun. A ring of fibrous tissue surrounding the optic nerve at its entrance at the apex of the orbit.

ANNULUS, noun. A toroidal shape; "a ring of ships in the harbor"; "a halo of smoke".

ANNULUS, noun. (Fungi) a remnant of the partial veil that in mature mushrooms surrounds the stem like a collar.