GEOID (from Gr. yij, the earth)

This article appears in Volume V11, Page 638 of the Encyclopedia Britannica.

Encyclopedia Britannica - Main :: GAG-GEO

GEOID (from Gr. yij, the earth) , an imaginary surface employed by geodesists which has the property that every

element

ELEMENT (Lat. elementum)

of it is perpendicular to the plumb-line where that line cuts it. Compared with the " spheroid of reference " the surface of the

geoid

GEOID (from Gr. yij, the earth)

is in general depressed over the oceans and raised over the

great

GREAT

land masses. (See EARTH, FIGURE OF THE.)
GEOK-TEPE, a former fortress of the Turkomans, in Russian Transcaspia, in the

oasis

OASIS (Gr. &toss, the name given by
Herodotus
- HERODOTUS (c. 484-425 B.C.)
to the fertile spots in the Libyan desert: it probably represents an Egyptian word, cf. Coptic ouahe, ouih, to dwell, from which the Egyptian Arabic sod is derived)

of Akhal-tekke, on the Transcaspian railway, 28 m. N.W. of

Askabad

ASKABAD, or ASKHABAD

. It consisted of a walled enclosure in circuit, the

wall

WALL (O. Eng. weal, weall, Mid. Eng. wal, wane, adapted from Lat. vallum, rampart; the
original
- ORIGINAL
O. Eng. word for a wall was wag or tenth)
WALL, RICHARD (1694-1778)

being 18 ft. high and 20 to 30 ft. thick. In December r88o the place was attacked by 6000 Russians under General Skobelev, and after a siege of twenty-three days was carried by

storm

, although the defenders numbered 25,000. A

monument

MONUMENT (Lat. monumentum or monumentum; from monere, to advise, bring to mind, remind; the German equivalent is Denkmal)

and a small museum com-
memorate the event.

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