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erythro-. erythro- or erythr- pref. 1. Red: erythrocyte. 2. Erythrocyte: erythropoiesis. [From Greek eruthros, red; see reudh- in Indo-European roots.] erythro- or erythr- combining form (Colours) red: erythrocyte. erythro- a combining form meaning âredâ (erythrocyte) or âred blood cellâ (erythropoiesis).
Hydronephrosis is the swelling of the kidneys when urine flow is obstructed in any of part of the urinary tract. Swelling of the ureter, which always accompanies hydronephrosis, is called hydroureter. Hydronephrosis implies that a ureter and the renal pelvis (the connection of the ureter to the kidney) are overfilled with urine.