isothere

noun

iso·​there

plural -s

: a line on a map or chart of the earth's surface connecting points having the same mean summer temperature

Word History

Etymology

French isothère, from is- + -thère (from Greek theros summer); akin to Greek thermos hot

Love words?

You must — there are over 200,000 words in our free online dictionary, but you are looking for one that’s only in the Merriam-Webster Unabridged Dictionary.

Start your free trial today and get unlimited access to America's largest dictionary, with:

• More than 250,000 words that aren't in our free dictionary
• Expanded definitions, etymologies, and usage notes
• Advanced search features
• Ad free!