Can be a symptom of kidney disease or obstruction of the urinary tract or edema or an imbalance of fluids and electrolytes in the body

• Abnormally small production of urine
• Production of an abnormally small amount of urine

Douglas Harper's Etymology Dictionary Word definitions in Douglas Harper's Etymology Dictionary
1843, from oligo- "small, little," + -uria , from Greek ouron "urine" (see urine ).

Wiktionary Word definitions in Wiktionary
n. (context medicine English) A decreased production in the volume of urine.

Wikipedia Word definitions in Wikipedia
Oliguria or hypouresis (both names from roots meaning "not enough urine") is the low output of urine . In humans, it is clinically classified as an output more than 80 ml/day but less than 400ml/day. The decreased output of urine may be a sign of dehydration ...

WordNet Word definitions in WordNet
n. abnormally small production of urine; can be a symptom of kidney disease or obstruction of the urinary tract or edema or an imbalance of fluids and electrolytes in the body production of an abnormally small amount of urine