Annulus (or anulus), being the Latin and French for "ring", is a term used to describe various ring or circle shaped objects (or openings):^[1][2]

• Annulus (entomology), an antennal unit in simple antennae, or a ring-like marking or structure surrounding a joint or segment. Latin ( lingua Latīna, laˈtiːna is an Italic language, historically spoken in Latium and Ancient Rome. French ( français,) is a Romance language spoken around the world by 118 million people as a native language and by about 180 to 260 million people Circles are simple Shapes of Euclidean geometry consisting of those points in a plane which are at a constant Distance, called the
• Annulus (Herpetology), reference to too small an opening that can be a potential death trap for a reptile that can't pass through. The size difference of the two cylindrical forms (The body of the animal vs. the circumference of the opening).
• Annulus (geology), the opening between an outer and inner cylindrical body, often used to describe the space between the well screen or drill pipe and the surface of the bore hole.
• Annulus (anatomy) refers to several structures in human anatomy. The spelling "anulus" is preferred under Terminologia Anatomica, but both spellings are commonly found. Terminologia Anatomica (TA is the international standard on human Anatomical terminology Examples include:
  • Annulus fibrosus cordis, the ring-like structure on a heart valve where the valve leaflets are anchored
  • Annulus fibrosus disci intervertebralis, the outer wall of the invertebral disc
  • Annulus femoralis
  • Annulus inguinalis superficialis
  • Annulus inguinalis profundus
  • Annulus tendineus communis
• Annulus (ichthyology), the annual rings that form in fish scales or bone sections
• Annulus (mycology), the "ring" on a mushroom stem
• Annulus (astronomy), the ring of light from the visible part of the photosphere seen at the greatest extent of an annular eclipse
• Annulus (cosmology), the ring around the lens on which strong gravitationally lensed images of one source appear
• Annulus (mathematics), a ring-shaped geometric figure
• Annulus (firestop), the space in a penetration seal surrounding a penetrant, i. The right and left fibrous rings of heart ( anulus fibrosus cordis) surround the Atrioventricular and arterial orifices and are stronger upon the left than on the Each Intervertebral fibrocartilage is composed at its circumference of laminæ of fibrous tissue and Fibrocartilage, forming the annulus fibrosus. The femoral ring is the base of the Femoral canal. It is directed upward and is oval in form its long diameter being directed transversely and measuring about 1 In the aponeurosis of the External oblique, immediately above the crest of the pubis, is a triangular opening the subcutaneous inguinal ring ( superficial inguinal The deep inguinal ring ( internal or deep abdominal ring, abdominal inguinal ring, internal inguinal ring) is the entrance to the Inguinal canal The annulus of Zinn, also known as the annular tendon or common tendinous ring, is a ring of fibrous tissue surrounding the Optic nerve at its entrance An annulus is the ring like structure sometimes found on the stipe of a Mushroom. A solar eclipse occurs when the Moon passes between the Sun and the Earth so that the Sun is wholly or partially obscured In Mathematics, an annulus (the Latin word for "little ring" with plural annuli) is a ring-shaped geometric figure or more generally a term The Annulus, or annular space, is the space between a Penetrant and whatever surrounds it such as the sides of an opening or a sleeve, as the case e. between a pipe or electrical conduit, or cable and a sleeve, with or without a firestop
• Annulus (oil well), the tube shaped void between a pipe string and a surrounding pipe string or formation. The annulus (yellow area in diagram of an oil well refers to any void between any piping tubing or casing and the piping tubing or casing immediately surrounding
• Annulus (microscopy), a circular opening "disk" below a specimen slide, required for Phase Contrast microscopy

• Annular hurricane, a hurricane that is nearly symmetrical and takes longer to weaken than normal hurricanes. An annular hurricane is a Tropical cyclone in the Atlantic or Eastern Pacific Oceans that features a large symmetric eye surrounded by a

References

Sharp, J. M. , Jr. , 1999, A Glossary of Hydrogeological Terms: The University of Texas, Austin, Texas

Principles of Contaminant Hydrogeology - Google Books Resultby Christopher M. Palmer - 1996 - Science - 256 pages

Schnirel, Brian - Leeway Corucia Research Center (LCRC), 2008 Watching for potential death traps The Official Discussion Board of the American Association of Zoo Keepers . . . General discussion forum.

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