annulus

an·nu·lus

A0319400 (ăn′yə-ləs)n. pl. an·nu·lus·es or an·nu·li (-lī′) 1. A ringlike figure, part, structure, or marking, such as a growth ring on the scale of a fish.2. a. A ring or group of thick-walled cells around the sporangia of many ferns that functions in spore release.b. The ringlike remains of a broken partial veil, found around the stipes of certain mushrooms.3. Mathematics The figure bounded by and containing the area between two concentric circles.

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[Latin ānulus, ring, diminutive of ānus.]

annulus

(ˈænjʊləs) n, pl -li (-ˌlaɪ) or -luses1. (Mathematics) the area between two concentric circles2. a ring-shaped part, figure, or space[C16: from Latin, variant of ānulus ring]

an•nu•lus

(ˈæn yə ləs)

n., pl. -li (-ˌlaɪ)
-lus•es. 1. a ringlike part, band, or space; ring. 2. the space between two concentric circles on a plane. 3. the veil remnant on a mushroom stalk. 4. a growth ring, as the annual ring of a tree trunk, that can be used to estimate age. [1555–65; < Latin, variant of ānulus=ān(us) ring + -ulus -ule]

Thesaurus

Noun	1.	annulus - a toroidal shape; "a ring of ships in the harbor"; "a halo of smoke"anchor ring, doughnut, halo, ringfairy circle, fairy ring - a ring of fungi marking the periphery of the perennial underground growth of the myceliumtoroid - the doughnut-shaped object enclosed by a torus
	2.	annulus - (Fungi) a remnant of the partial veil that in mature mushrooms surrounds the stem like a collarskirtFungi, fungus kingdom, kingdom Fungi - the taxonomic kingdom including yeast, molds, smuts, mushrooms, and toadstools; distinct from the green plantsplant part, plant structure - any part of a plant or funguspartial veil - membrane of the young sporophore of various mushrooms extending from the margin of the cap to the stem and is ruptured by growth; represented in mature mushroom by an annulus around the stem and sometimes a cortina on the margin of the cap

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