a line on a map connecting places registering the same amount or ratio of some geographical or meteorological phenomenon or phenomena
Also called: isogram, isoline
WordReference Random House Unabridged Dictionary of American English © 2025
i•so•pleth
(ī′sə pleth′),USA pronunciation n.
- Geography, Place Namesa line drawn on a map through all points having the same numerical value, as of a population figure or geographic measurement. Also called isarithm.
- Greek isoplēthé̄s equal in number, equivalent. to iso- iso- + plêth(os) a great number + -ēs adjective, adjectival suffix
- 1905–10
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'isopleth' also found in these entries (note: many are not synonyms or translations):