Annulus – Definition & Meaning

The word annulus is not a common term, but it is used in various fields such as mathematics, anatomy, and physics. It is a Latin word that means “ring” or “circle.” In this article, we will explore the definitions, origins, meanings, associations, synonyms, antonyms, and example sentences of annulus.

Definitions

In mathematics, an annulus is a region between two concentric circles. It is a two-dimensional space that is bounded by two circles, an inner circle, and an outer circle. The area of an annulus can be calculated by subtracting the area of the inner circle from the area of the outer circle.
In anatomy, the annulus refers to the outer part of the intervertebral disc, which is the cushion between the vertebrae in the spine. The annulus is made up of fibrous tissue and surrounds the nucleus pulposus, which is the gel-like substance in the center of the disc.
In physics, annulus refers to a ring-shaped object that is used in experiments to study the properties of light.

Origin

The word annulus comes from the Latin word “annulus,” which means “ring” or “circle.” The word “annulus” can be traced back to the Proto-Indo-European root “h₂enh₁-,” which means “to encircle.”.

Meaning in different dictionaries

According to the Merriam-Webster dictionary, annulus is defined as “a ring-shaped part, structure, or marking.”.
The Oxford English Dictionary defines annulus as “a ring-shaped structure, especially a part of a plant, animal, or machine.”.

Associations

Annulus is associated with geometry, anatomy, physics, and engineering. It is used in various fields to describe ring-shaped objects or structures.

Synonyms

The synonyms of annulus include ring, circle, loop, band, hoop, and wreath.

Antonyms

There are no specific antonyms of annulus, as it is a specific term that describes a ring-shaped object or structure.

The same root words

The same root words as annulus include annular, which means “ring-shaped,” and annulate, which means “having rings or ring-like markings.”.

Example Sentences

  1. The annulus of the intervertebral disc is made up of fibrous tissue.
  2. The annulus of the planet Saturn is one of its most distinctive features.
  3. The experimental setup consisted of an annulus-shaped object that was illuminated with a laser.
  4. The wedding band is a symbol of the annulus of love and commitment.
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