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Meaning of isobath

i•so•bath

Pronunciation: (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.