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The Collaborative International Dictionary
Isorropic line

Isorropic \I`sor*rop"ic\,

  1. [Gr. 'iso`rropos in equipoise; 'i`sos equal + "roph` downward inclination or momentum.] Of equal value.

    Isorropic line (in a diagram) (Geom.), the locus of all the points for which a specified function has a constant value.
    --Newcom