Noun: diameter dI'a-mi-tu(r)
- The length of a straight line passing through the centre of a circle and connecting two points on the circumference
"The diameter of the circle was twice the length of its radius";
- diam
- A straight line connecting the centre of a circle with two points on its perimeter (or the centre of a sphere with two points on its surface)
"The diameter of the Earth is approximately 12,742 kilometres"
Derived forms: diameters
Type of: length, straight line
Encyclopedia: Diameter