"Isotheral" is a word in ENGLISH

isotheral ENGLISH
Definition:

Having the nature of an isothere; indicating the
distribution of temperature by means of an isothere; as, an isotheral
chart or line.

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isocheim ENGLISH

A line connecting places on the earth having the same mean winter temperature. Cf. Isothere.

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isothere ENGLISH

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

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