Bible Dictionaries
Isotherm

Webster's Dictionary

(n.) A line connecting or marking points on the earth's surface having the same temperature. This may be the temperature for a given time of observation, or the mean temperature for a year or other period. Also, a similar line based on the distribution of temperature in the ocean.

Bibliography Information
Webster, Noah. Entry for 'Isotherm'. Noah Webster's American Dictionary. https://www.studylight.org/​dictionaries/​eng/​web/​i/isotherm.html. 1828.