geoidn.

Brit.

/ˈdʒiːɔɪd/, U.S.

/ˈdʒiˌɔɪd/

Origin: Formed within English, by derivation; modelled on a German lexical item. Etymons: geo- comb. form, -oid suffix.

Etymology: < geo- comb. form + -oid suffix, after German Geoid ( J. B. Listing Ueber unsere jetzige Kenntniss der Gestalt u. Größe der Erde (1872) 9).

A notional surface approximating the shape of the earth at mean sea level, being at every point perpendicular to the direction of gravity at that point; a level or equipotential surface approximating the mean level of the undisturbed sea.The geoid is a more accurate but more complex figure than the ellipsoid usually used for purposes of computation.

ΘΚΠ

the world > relative properties > number > geometry > shape or figure > [noun] > three-dimensional > sphere > spheroid

tun form1551

spheroid1664

prolate spheroid1724

ellipsoid1734

geoid1880

1880 Van Nostrand's Engin. Mag. Mar. 237/2 The geoid, then, is an irregular figure peculiar to our planet; so irregular, indeed, that some have irreverently likened it unto a potato.

1912 J. F. Hayford & W. Bowie Effect of Topogr. & Isostatic Compensation upon Intensity of Gravity 112 A study was made to see if a possible relation could be discovered between the gravity anomalies..and the geoid contours.

1955 Sci. Amer. Sept. 168/2 If we took gravity readings all over the earth and corrected them to sea level, we would have a gravity profile of the geoid.

1991 New Scientist 27 Apr. 44/2 In order to obtain a global picture of currents it is necessary to determine the geoid by other means and then subtract the geoid from the altimeter image.

2004 D. Pugh Changing Sea Levels vii. 167 Eddies are seen in altimeter data as time-varying (this distinguishes them from permanent geoid variations) sea levels.

Derivatives

geˈoidal adj. of or relating to the geoid.

ΚΠ

1880 Van Nostrand's Engin. Mag. Mar. 237/2 Our geoidal surface to be investigated is that coinciding with the surface of the great oceans.

1931 Bull. Nat. Res. Council lxxviii. vii. 113 Figure of the Earth.—The defining elements of the mathematical surface which approximates the geoidal surface.

1951 Proc. Royal Soc. A. 206 1 At present the great surveys are in disconnected systems and are partially spheroidal and partially geoidal.

2010 Comptes Rendus Geosci. 342 88/2 Many countries across the world have already developed their own geoidal model.

This entry has been updated (OED Third Edition, March 2012; most recently modified version published online March 2022).

单词	geoid
释义	geoidn. Brit. /ˈdʒiːɔɪd/, U.S. /ˈdʒiˌɔɪd/ Origin: Formed within English, by derivation; modelled on a German lexical item. Etymons: geo- comb. form, -oid suffix. Etymology: < geo- comb. form + -oid suffix, after German Geoid ( J. B. Listing Ueber unsere jetzige Kenntniss der Gestalt u. Größe der Erde (1872) 9). A notional surface approximating the shape of the earth at mean sea level, being at every point perpendicular to the direction of gravity at that point; a level or equipotential surface approximating the mean level of the undisturbed sea.The geoid is a more accurate but more complex figure than the ellipsoid usually used for purposes of computation. ΘΚΠ the world > relative properties > number > geometry > shape or figure > [noun] > three-dimensional > sphere > spheroid tun form1551 spheroid1664 prolate spheroid1724 ellipsoid1734 geoid1880 1880 Van Nostrand's Engin. Mag. Mar. 237/2 The geoid, then, is an irregular figure peculiar to our planet; so irregular, indeed, that some have irreverently likened it unto a potato. 1912 J. F. Hayford & W. Bowie Effect of Topogr. & Isostatic Compensation upon Intensity of Gravity 112 A study was made to see if a possible relation could be discovered between the gravity anomalies..and the geoid contours. 1955 Sci. Amer. Sept. 168/2 If we took gravity readings all over the earth and corrected them to sea level, we would have a gravity profile of the geoid. 1991 New Scientist 27 Apr. 44/2 In order to obtain a global picture of currents it is necessary to determine the geoid by other means and then subtract the geoid from the altimeter image. 2004 D. Pugh Changing Sea Levels vii. 167 Eddies are seen in altimeter data as time-varying (this distinguishes them from permanent geoid variations) sea levels. Derivatives geˈoidal adj. of or relating to the geoid. ΚΠ 1880 Van Nostrand's Engin. Mag. Mar. 237/2 Our geoidal surface to be investigated is that coinciding with the surface of the great oceans. 1931 Bull. Nat. Res. Council lxxviii. vii. 113 Figure of the Earth.—The defining elements of the mathematical surface which approximates the geoidal surface. 1951 Proc. Royal Soc. A. 206 1 At present the great surveys are in disconnected systems and are partially spheroidal and partially geoidal. 2010 Comptes Rendus Geosci. 342 88/2 Many countries across the world have already developed their own geoidal model. This entry has been updated (OED Third Edition, March 2012; most recently modified version published online March 2022). < n.1880
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