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Great Green Wall a multinational African initiative to fight desertification and land degradation by modification of land use, water harvesting, and the planting and maintenance of trees primarily along the southern edge of the Sahara Desert, a belt of land that stretches across the width of the continent. [2 definitions]
great gross a unit of quantity equal to twelve gross.
greathearted having a generous nature; magnanimous. [2 definitions]
great horned owl a large gray and brown North American owl that has two large earlike tufts of blackish feathers.
Great Lakes five large interconnected freshwater lakes on the border between the United States and Canada; Lakes Superior, Michigan, Huron, Erie, and Ontario.
great laurel a large wild rhododendron of the eastern United States that has thick glossy dark green leaves and bears clusters of white or pink flowers.
greatly very much. [2 definitions]
Great Mogul the title of the emperor of the former Mongol empire that was established in India in 1526. [2 definitions]
Great Nebula the brightest and closest of nebulae, located in the constellation of Orion.
great-nephew a son of one's nephew or niece; grandnephew.
great-niece a daughter of one's nephew or niece; grandniece.
Great Pacific Garbage Patch a vast accummulation of debris made up primarily of tiny plastic particles floating in the upper column of water in the north central region of the Pacific Ocean.
Great Pyramid of Giza a limestone and granite pyramid, which is the oldest and only remaining of the Seven Wonders of the Ancient World, built circa 2500 B.C.E. as a memorial and tomb for King Khufu, the second king of the fourth Egyptian dynasty.
Great Sandy Desert a desert region in northwestern Australia.
great seal the chief seal of a government or state, used to stamp official documents.
great-uncle the brother of one's grandfather or grandmother; granduncle.
Great Victoria Desert a desert region in southwestern Australia.
Great Vowel Shift a series of shifts in English vowel sounds that took place from the fifteenth to the eighteenth century and changed the vowel system of Middle English into that of Modern English.
Great War World War I.
great white shark any of the family of large predatory fishes of the world's temperate coastal regions that has a white underbelly, multiple rows of rotating teeth, and an average size of 13 feet (4 m.) in length and 4000 pounds (1814 kg.) in weight.
greaves (used with a sing. or pl. verb) the remaining residue when animal fat is melted down for tallow or the like; cracklings.