1. A backflow of urine from the ureter into the renal pelvis

Type of: reflux

• front tooth
• front yard
• front-porch campaign
• front-porch campaigning
• front-runner
• frontage
• frontage road
• frontal
• frontal bone
• frontal cortex
• frontal eminence
• frontal gyrus
• frontal lobe
• frontal lobotomy
• frontal sinus
• frontal suture
• frontally
• frontbencher
• frontier
• frontier settlement
• frontiersman
• frontierswoman
• frontispiece
• frontlet
• frontmost