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isobathytherm
isobathytherm n. 
/ˌaɪsəˈbæθəˌθərm/ [Greek βαθύς deep + θέρμη heat] a line connecting points having the same temperature in a vertical section of any part of the sea (also isothermobath n. at isothermal adj. and n. Derivatives).
Brit. /ˌʌɪsə(ʊ)ˈbaθᵻθəːm/
, /ˌʌɪsə(ʊ)ˈbaθᵻθəːm/U.S. /ˌaɪsoʊˈbæθəˌθərm/
, /ˌaɪsoʊˈbæθəˌθərm//ˌaɪsəˈbæθəˌθərm/Π
1876 Sir C. W. Thomson cited in Cent. Dict. for Isobathytherm.
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