isobath

[ahy-suh-bath]
noun
1.
an imaginary line or one drawn on a map connecting all points of equal depth below the surface of a body of water.
2.
a similar line for indicating the depth below the surface of the earth of an aquifer or the top of the water table.

Origin:
1885–90; < Greek isobathḗs of equal depth. See iso-, batho-

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World English Dictionary
isobath (ˈaɪsəʊˌbæθ)
 
n
a line on a map connecting points of equal underwater depth
 
[C19: from Greek isobathēs of equal depth, from iso- + bathos depth]
 
iso'bathic
 
adj

Collins English Dictionary - Complete & Unabridged 10th Edition
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Example sentences
In reality the samples are not taken along the isobath.
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