- (n.) Any right line passing through the center of a figure or body, as a circle, conic section, sphere, cube, etc., and terminated by the opposite boundaries; a straight line which bisects a system of parallel chords drawn in a curve.
- (n.) The length of a straight line through the center of an object from side to side; width; thickness; as, the diameter of a tree or rock.
- (n.) The distance through the lower part of the shaft of a column, used as a standard measure for all parts of the order. See Module.
- (n.) A diametral plane.
Webster's Revised Unabridged Dictionary
| APA | Webster's. (2011). diameter. Retrieved September 20, 2026, from http://smartdefine.org/diameter/definitions/1997220 |
| Chicago | Webster's. 2011. "diameter" http://smartdefine.org/diameter/definitions/1997220 (accessed September 20, 2026). |
| Harvard | Webster's 2011, diameter, Smart Define, viewed 20 September, 2026, <http://smartdefine.org/diameter/definitions/1997220>. |
| MLA | Webster's. "diameter" 27 May 2011. Web. 20 September 2026. <http://smartdefine.org/diameter/definitions/1997220> |