isogonicadj.1n.
/ʌɪsəʊˈɡɒnɪk/ Physical Geography.
Indicating equal angles (of magnetic variation); applied to lines on a map, etc. connecting points of the earth's surface where the magnetic declination, or variation from the true north, is the same; or to a map, etc. exhibiting such lines. Also as n. An isogonic line.
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the world > matter > physics > electromagnetic radiation > magnetism > earth magnetism > [noun] > lines on maps or diagrams
isoclinal1889
isogonic1892
isogam1940
1849 E. Sabine in J. F. W. Herschel Man. Sci. Enq. (Lords Commissioners Admiralty) 27 The Isogonic lines..have a direct practical importance and value in navigation.
1866 R. M. Ferguson Electricity 27 The lines of equal declination are called isogonic lines; those of equal dip, isoclinic; and those of equal intensity, isodynamic lines.
1876 C. H. Davis Narr. North Polar Exped. Ship Polaris App. 642 With regard to the variations of the compass, as derived from an isogonic chart.
1892 J. Thornton Adv. Physiogr. xvi. §257 These two sets of magnetic lines, isogonics and isoclinics.
This entry has not yet been fully updated (first published 1900; most recently modified version published online September 2019).
isogonicadj.2
Biology.
Characterized by isogonism. Of an organ, growing at the same rate as its parent body.
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the world > life > biology > biological processes > development, growth, or degeneration > [adjective] > growth > rates of growth
allometric1911
heterogonic1924
isogonic1924
isometric1950
1901 In mod. Dicts.
1924 J. S. Huxley in Nature 20 Dec. 895/1 Pézard..has styled the growth of such an organ heterogonic..as opposed to isogonic.
1932 J. S. Huxley Probl. Relative Growth i. ii. 8 An organ which..is growing at the same rate as the body..must be styled isogonic.
1945 Richards & Kavanagh in Clark & Medawar Ess. Growth & Form 219 Isogonic growth is a special case of isotropic growth in which the specific growth-rate in length is the same at every point throughout the organism.
Derivatives
iˈsogony n. growth of this kind.
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the world > life > biology > biological processes > development, growth, or degeneration > [noun] > growth > rates of growth
heterauxesis1886
heterogony1927
growth-gradient1929
isogony1932
allometry1936
isometry1950
1932 J. S. Huxley Probl. Relative Growth i. iii. 38 It is justifiable to regard isogony as a special case of heterogony, with growth-coefficiency unity.
This entry has not yet been fully updated (first published 1900; most recently modified version published online June 2019).
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adj.1n.1849adj.21901