|a calculus or concretion found in the stomach or intestines of certain animals, esp. ruminants, formerly reputed to be an effective remedy for poison.|
|a screen or mat covered with a dark material for shielding a camera lens from excess light or glare.|
|grassland (grās'lānd') Pronunciation Key
An area that is dominated by grass or grasslike vegetation. Moderately dry climatic conditions and seasonal disturbances, such as floods or fires, are generally conducive to the growth of grasses and prohibitive of that of trees and shrubs. Grasslands are found in tropical, subtropical, and temperate regions and typically occupy regions between forests and deserts.
area in which the vegetation is dominated by a nearly continuous cover of grasses. Grasslands occur in environments conducive to the growth of this plant cover but not to that of taller plants, particularly trees and shrubs. The factors preventing establishment of such taller, woody vegetation are varied
Learn more about grassland with a free trial on Britannica.com.