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Definition of: isogeotherm
(ī′sō·jē′ə·thərm) noun Geol.
A line or surface along which the earth, below its surface, has the same temperature. [<ISO- + GEO- + Gk. thermē heat]
—i′so·ge′o·ther′mal, i′so·ge′o·ther′mic adjective
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