Final answer:
The prefix 'oligo' in the word 'oliguria' means 'few' or 'scanty', referring to a medical condition where the urine output is abnormally low, usually below 600 ml/day.
Step-by-step explanation:
The prefix 'oligo' in the word 'oliguria' means 'few' or 'scanty'. Oliguria is a medical condition characterized by the production of abnormally small amounts of urine. For instance, the excretion of urine may be less than 600 ml/day, which can be seen in various conditions such as fever, shock, vomiting, and diarrhoea. More severe cases, where urine excretion is below 10 ml/day, fall into the category of anuria, a more extreme reduction or absence of urine output.