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blastopore
blastopore A mouth-like opening of the archenteron on the surface of an embryo in the gastrula stage. In many animals the blastopore becomes the anus, although in some it closes up at the end of gastrulation and may appear again at or near the same site. The blastopore is formed by an inward... Read more |
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precession of the equinoxes
precession of the equinoxes westward motion of the equinoxes along the ecliptic . This motion was first noted by Hipparchus c.120 BC The precession is due to the gravitational attraction of the moon and sun on the equatorial bulge of the earth, which causes the earth's axis to describe a cone in... Read more |
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Fort Necessity
Fort Necessity entrenched camp built in July, 1754, by George Washington and his Virginia militia at Great Meadows (near the present Uniontown, Pa.). He retired there when he learned that the British fort at the forks of the Ohio (the site of Pittsburgh) had been captured (and renamed Fort... Read more |
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Battle of Edington
Edington, battle of, 878. After the disaster at Chippenham in January 878, Alfred was reduced for some months to guerrilla warfare from the marshes around Athelney. By May he was ready to attack again and encountered Guthrum's Danes at Edington, near Westbury on the Wiltshire downs. The decisive... Read more |
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Louis Jolliet
Louis Jolliet , 1645-1700, French explorer, joint discoverer with Jacques Marquette of the upper Mississippi River, b. Quebec prov., Canada. After a year's study of hydrography in France and some years as a trader and trapper on the Great Lakes, Jolliet was appointed (1672) as leader of an... Read more |
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Machpelah
Machpelah , cave, near Hebron; also called the Cave of the Patriarchs. The Book of Genesis relates that it was bought by Abraham from Ephron, son of Zohar the Hittite, for a family burial place. The Mosque of Ibrahim, which now encloses the site, may be a successor to a structure built by the... Read more |
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Near-Drowning
Near-drowning Definition Near-drowning is the term for survival after suffocation caused by submersion in water or other fluid. Some experts exclude from this definition cases of temporary survival that end in death within 24 hours, which they prefer to classify as... Read more |
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Monasterboice
Monasterboice , village, Co. Louth, E Republic of Ireland. It is one of the oldest monastic sites in Ireland, established near the end of the 5th cent. There are ruins of a round tower, two churches, and ancient crosses.... Read more |
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Babol
Babol , town (1991 pop. 137,348), N Iran, near the Caspian Sea, NE of Tehran. It is the region's chief commercial center and was once the major trading center of N Iran. Processed food and textiles are produced, and fruits, tea, tobacco, and cotton are raised nearby. Founded in the 16th cent., it... Read more |
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