radius meaning
EN
[ˈɹeɪdiəs] [-eɪdiəs] WRadius
- In classical geometry, the radius of a circle or sphere is the length of a line segment from its center to its perimeter. The name comes from Latin radius, meaning "ray" but also the spoke of a chariot wheel.
- If an object does not have an obvious center, the term may refer to its circumradius, the radius of its circumscribed circle or circumscribed sphere.
- For regular polygons, the radius is the same as its circumradius. The inradius of a regular polygon is also called apothem.
- The radius of the circle with perimeter (circumference) C is
FR radius 
- NounPLradiiPLradiuses
- (anatomy) The long bone in the forearm, on the side of the thumb.
- (zoology) The lighter bone (or fused portion of bone) in the forelimb of an animal.
- (entomology) One of the major veins of the insect wing, between the subcosta and the media.
- (geometry) A line segment between any point on the circumference of a circle and its center/centre.
- (geometry) The length of this line segment.
- (anatomy) The long bone in the forearm, on the side of the thumb.
- More Examples
- Used in the Middle of Sentence
- A 43° angle subtends an arc about ¾ meter long on a circle with a radius of 1 meter.
- Used in the Middle of Sentence
Definition of radius in English Dictionary
- Part-of-Speech Hierarchy
- Nouns
- Nouns with irregular plurals
- Countable nouns
- Nouns with irregular plurals
- Nouns
- fr radius
- en radiused
- en radiuses
- en radius vector
- en radius vectors
Source: Wiktionary
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Grammatically, this word "radius" is a noun, more specifically, a nouns with irregular plural and a countable noun.