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The Collaborative International Dictionary
Isodynamic lines

Isodynamic \I`so*dy*nam"ic\, a. [Iso- + dynamic.] Of, pertaining to, having, or denoting, equality of force.

Isodynamic foods (Physiol.), those foods that produce a similar amount of heat.

Isodynamic lines (Magnetism), lines on the earth's surface connecting places at which the magnetic intensity is the same.