Pronunciation: (dī-am'i-tur), [key]
a. a straight line passing through the center of a circle or sphere and meeting the circumference or surface at each end.
b. a straight line passing from side to side of any figure or body, through its center.
2. the length of such a line.
3. the width of a circular or cylindrical object.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.