Proteinuria

n. presence of protein in the urine (Medicine)

Proteinuria (from protein and urine) means the presence of an excess of serum proteins in the urine. The protein in the urine often causes the urine to become foamy, although foamy urine may also be caused by bilirubin in the urine (bilirubinuria), retrograde ejaculation, pneumaturia (air bubbles in the urine) due to a fistula, or drugs such as pyridium.
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Proteinuria /pro·tein·uria/ an excess of serum proteins in the urine, as in renal disease or after strenuous exercise.proteinu´ric pro·tein·u·ri·a n. [more]Proteinuria - Community and Resources

Noun
1. the presence of excessive protein (chiefly albumin but also globulin) in the urine; usually a symptom of kidney disorder
(synonym) albuminuria
(hypernym) symptom

Excess protein in the urine. Some protein is normal in the urine. But too much means protein is leaking through the kidney, most often through the glomeruli.