diameter

noun4

1. •
   Any straight line between two points on the circumference of a circle that passes through the center of the circle; a chord that passes through the center of the circle.
2. •
   The length of such a line.

   • Viable non-malformed singleton pregnancies were selected for cerebellar measurements; transcerebellar diameter, (TCD), left and right cerebellar diameters (LCD, RCD). — 2015
3. •
   The maximum distance between any two points in a metric space.
4. •
   The maximum eccentricity over all vertices in a graph.