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annulus

   Also found in: Medical, Encyclopedia, Wikipedia, Hutchinson 0.02 sec.
an·nu·lus  (ny-ls)
n. pl. an·nu·lus·es or an·nu·li (-l)
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.
[Latin nulus, ring, diminutive of nus.]
annulus  (ny-ls)
Plural annuluses or annuli (ny-l)
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 specialized cells around the sporangia of many ferns. By changing shape in response to variations in humidity, it breaks open the sporangium and then releases the spores with a whipping motion.
3. The ringlike remains of a membrane (called a veil), found around the stipes of certain basidiomycete mushrooms. The presence or absence of an annulus is often used to identify the species of an individual mushroom.
4. The figure bounded by and containing the area between two concentric circles.
ThesaurusLegend:  Synonyms Related Words Antonyms
Noun1.annulus - a toroidal shape; "a ring of ships in the harbor"; "a halo of smoke"
anchor ring, doughnut, halo, ring
fairy circle, fairy ring - a ring of fungi marking the periphery of the perennial underground growth of the mycelium
toroid - 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 collar
skirt
Fungi, fungus kingdom, kingdom Fungi - the taxonomic kingdom including yeast, molds, smuts, mushrooms, and toadstools; distinct from the green plants
plant part, plant structure - any part of a plant or fungus
partial 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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Approximately 3 to 5 mm from the annulus in the middle and interior portions of the canal, a trough was palpated.
Aberrant facial nerve by Vambutas, Andrea / Ear, Nose and Throat Journal
It is, however, essential that the magnetic field be uniform at the position of the mirror electrode, and to this end a permanent magnet in the form of an annulus has been built into the mirror electrode.
Determination of the electron-antineutrino angular correlation ... by Byrne, J. / Journal of Research of the National Institute of Standards and Technology
Rather than a conventional epicyclic gear with meshing teeth, a Rotrex traction-drive system that uses oil viscosity to transfer motion between the sun, planets and annulus, has been adopted.
Innovations for C[O.sub.2] reduction by Kimberley, William / Automotive Design & Production
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