• (a.) Pertaining to, having the nature of, or marking, isogeotherms; as, an isogeothermal line or surface; as isogeothermal chart. • (n.) An isogeotherm.
isogeothermal, isogeothermic A descriptive reference to a line or surface (usually imaginary) connecting points in the interior of the earth having the same temperature; an isogeothermal line.