What is the condition of decreased or less-than-normal amounts of urine secretion called?

The condition characterized by decreased or less-than-normal amounts of urine secretion is known as oliguria. This term specifically refers to the production of urine that is insufficient to meet the body's needs, which can indicate underlying health issues, such as dehydration, kidney problems, or other medical conditions affecting renal function. In clinical practice, recognizing oliguria is essential as it may be a sign of significant health concerns that require immediate attention and intervention.

In contrast, the other options refer to different concepts. Ombudsman relates to a designated individual who addresses complaints or concerns within organizations. Open bed refers to a specific state in healthcare settings concerning patient bed readiness. Oncology is the branch of medicine that deals with cancer and tumors, unrelated to urine production. Thus, oliguria is the only term that directly relates to altered urine output as described in the question.