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.
A diametral plane.
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.
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.
Now, therefore, the Directors of the company are hereby ordered to see that precautions are taken to make travel on said railroad perfectly safe by using a screw with at least twenty-four inches diameter. Joshua A. Norton
Ground-based telescopes are much larger than Hubble. Keck is four times larger than Hubble in diameter, which means that you can see four times the detail than you can see with Hubble, if you can figure out how to use these techniques. Andrea M. Ghez