Dictionary![]() ![]() i•so•bathPronunciation: (ī'su-bath"), [key] —n. 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. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.
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