isarithm

noun

isa·​rithm

ˈīsəˌrit͟həm,

-th- also ˈīzə-

plural -s

: a line drawn on a map or chart to connect points having equal numerical values (as of temperature, elevation, or density of population)

Word History

Etymology

International Scientific Vocabulary is- + -arithm (from Greek arithmos number); originally formed as German isarithmus

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