You searched for: “annulus
annulus (AN yuh luhs)
1. A ringlike figure, part, structure, or marking; such as, a growth ring on the scale of a fish.
2. A ring or group of thick-walled cells around the sporangia of many ferns that functions in spore release.

The ringlike remains of a broken partial veil, found around the stipes of certain mushrooms.

3. In mathematics, the figure bounded by and containing the area between two concentric circles.
Word Entries at Word Info: “annulus
annulus (s), annuluses, annuli (pl)
A ringlike structure, or any body part that is shaped like a ring; which is applied to many small ring-shaped structures; such as, parts in a plant or animal, for example, a growth ring on fish scales.

The base of a heart valve that supports the valve's leaflets is called the annulus and a ring-shaped pancreas that encircles the duodenum is an annular pancreas.

Annulus is a misspelling of the Latin anulus, "a little ring", the diminutive of the Latin anus, "a ring of more substantial size"; so, keep in mind that anulus is now the preferred spelling for any "ringlike structure" reference.

This entry is located in the following units: annul-, anul- (page 1) -ulus, -olus, -ulum, -ola (page 1)