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ruminant

(Encyclopedia)ruminant, any of a group of hooved mammals that chew their cud, i.e., that regurgitate and chew again food that has already been swallowed. Ruminants have an even number of toes on each foot and a sto...

athlete's heart

(Encyclopedia)athlete's heart, common term for an enlarged heart associated with repeated strenuous exercise. As a result of the increased workload required of it, the heart will increase physiologically by enlargi...

nautilus, in zoology

(Encyclopedia)nautilus or chambered nautilus, cephalopod mollusk belonging to the sole surviving genus (Nautilus) of a subclass that flourished 200 million years ago, known as the nautiloids. The spirally coiled sh...

pyramid, structure

(Encyclopedia)pyramid. The true pyramid exists only in Egypt and Sudan, though the term has also been applied to similar structures in other countries. Egyptian pyramids are square in plan and their triangular side...

Wyandotte Cave

(Encyclopedia)Wyandotte Cave, one of the largest natural caverns in the United States, S Ind., W of New Albany; discovered in 1798. There are 23 mi (37 km) of passages and several large and beautiful chambers on fi...

Pithom

(Encyclopedia)Pithom pīˈthŏm [key], in the Bible, the ancient treasure city of Egypt, in the eastern part of the Nile delta, built by the Israelites for the pharaoh. Ruins include walls of storage chambers. ...

Carlsbad Caverns National Park

(Encyclopedia)Carlsbad Caverns National Park, 46,766 acres (18,940 hectares), SE N.Mex., in the Guadalupe Mts.; designated a national park in 1930. These connecting limestone caves, with remarkable stalactite and s...

Eddington, Sir Arthur Stanley

(Encyclopedia)Eddington, Sir Arthur Stanley, 1882–1944, British astronomer and physicist. He was chief assistant (1906–13) at the Royal Observatory, Greenwich, and was from 1913 Plumian professor of astronomy a...

Constitution of Athens

(Encyclopedia)Constitution of Athens, treatise by Aristotle or a member of his school, written in the late 4th cent. b.c. It was lost until discovered on Egyptian papyrus in 1890. It is a history of the Athenian go...

chamber of commerce

(Encyclopedia)chamber of commerce, local association of business people organized to promote the welfare of their community, especially its commercial interests. Each chamber of commerce usually has an elected boar...