the.com/uremia

Uremia is a dangerous buildup of waste in the blood when failing kidneys can no longer filter it out.

means Uremia is the toxic buildup of waste products (like urea) in the blood when the kidneys fail to filter them out as urine.

from From Greek ouron 'urine' plus haima 'blood' — a 19th-century medical coinage built to say exactly what it means: urine in the blood. Doctors of the time literally believed urine itself was backing up into the bloodstream; we now know it's the nitrogen-waste compounds urine normally carries away that accumulate instead, but the blunt Greek compound stuck.

literal meaning
urine in the blood, which is exactly as bad as it sounds
telltale sign
breath smelling like ammonia or stale urine
not a disease
a symptom complex, kidneys failing is the real culprit
fix
dialysis, which does the filtering your kidneys gave up on
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