|a screen or mat covered with a dark material for shielding a camera lens from excess light or glare.|
|a calculus or concretion found in the stomach or intestines of certain animals, esp. ruminants, formerly reputed to be an effective remedy for poison.|
|1.||a. a straight line connecting the centre of a geometric figure, esp a circle or sphere, with two points on the perimeter or surface|
|b. the length of such a line|
|2.||the thickness of something, esp with circular cross section|
|[C14: from Medieval Latin diametrus, variant of Latin diametros, from Greek: diameter, diagonal, from |
diameter di·am·e·ter (dī-ām'ĭ-tər)
A straight line connecting two opposite points on the surface of a spherical or cylindrical body, or at the boundary of an opening or foramen, passing through the center of such body or opening.
The distance measured along such a line.