|a screen or mat covered with a dark material for shielding a camera lens from excess light or glare.|
|an extraordinary or unusual thing, person, or event; an exceptional example or instance.|
medieval cannon of relatively long barrel and light construction. It fired light (8-16-pound [3.6-7.3-kg]) projectiles at long ranges along a flat trajectory.
Learn more about culverin with a free trial on Britannica.com.