isopleth noun. ['ʌɪsǝ(ʊ)plɛƟ] E20.
[from Greek isoplēthēs equal in quantity, formed as ISO- + plēthos multitude, quantity.]
1. A line (imaginary or on a map or diagram) connecting points for which some chosen quantity has the same value. E20.
2. Physical Chemistry. A line or surface (in a diagram) joining points that represent mixtures having the same composition. E20.

■ isoplethal [-'pli:Ɵ(ǝ)l] adjective carried out or occurring at constant composition E20.

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