re·no·gram 
(rēnə-grăm′)
(rēnə-grăm′)n.
1. A graphic record of the passage of radiation through the renal system after injection of a radioactive tracer.
2. A radiograph of a kidney.
[Latin rēnēs, kidneys + -GRAM.]
re′nogra·phy (rē-nŏgrə-fē) n.