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8 Words That Are Older Than You Think

geotherm

/ˈdʒiːəʊˌθɜːm/
noun
1.
a line or surface within or on the earth connecting points of equal temperature
2.
the representation of such a line or surface on a map or diagram
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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