isotherm

A line drawn on a weather map or chart linking all points of equal or constant temperature.

In mathematics, a curve representing phenomena which happen at constant temperature.

A line connecting points on the earth’s surface having the same mean temperature.

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.

A line on a graph connecting points representing states having the same temperature; an isothermal line.

A line of equal or constant temperature on a graph or chart, such as a weather map.

(meteorology) an isogram connecting points having the same temperature at a given time