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isobath
isobath adj. and n. 
/ˈʌɪsə(ʊ)baθ/,
Brit. /ˈʌɪsə(ʊ)bɑːθ/
, /ˈʌɪsə(ʊ)bɑːθ//ˈʌɪsə(ʊ)baθ/U.S. /ˈaɪsəˌbæθ/
[Greek βάθος depth] (a) adj. trade-name for an inkstand with a float so contrived as to keep the ink in the dipping-well at a constant level; (b) n. a line (either imaginary or on a map) joining places where water has equal depth; an underwater contour./ˈaɪsəˌbæθ/ΘΚΠ
the world > the earth > earth sciences > geography > map-making > map > [noun] > line on map > water features
cotidal line1833
isobath1889
isochlor1890
isohaline1902
isopycnal1927
1889 Advt. New patent ‘Isobath’ Constant-level inkstand.
1895 Rep. Sci. Results Voy. H.M.S. Challenger, Summary I. 55 Bauche..is..considered as the first to make use of isobaths for the sea.
1903 Nature 29 Oct. 632 Warm currents follow the trend of deepest isobaths.
1938 Jrnl. Marine Res. 1 138 (caption) Isobaths (light broken lines) for every ten meters depth.
1956 Trans. Amer. Microsc. Soc. 75 335 Miner's map is our primary source of that shore line..just as it is for the contained isobaths. The Commission..has in no way modified the lakes except to build a bathing beach and boat docks.
1972 Nature 4 Feb. 253/2 Thus Corsica makes a good fit with France along the 1,000-metre isobath.
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