isobase
noun
iso·base
: an imaginary line or a line on a map or chart passing through all points that have been elevated to the same extent since some specified time (as the Glacial epoch)
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“Isobase.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/isobase. Accessed 28 Nov. 2024.
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