Almost always seen as part of medical compounds:
泌尿科 (mìniàokē, urology department),
泌尿系统 (mìniào xìtǒng, urinary system),
泌尿外科 (mìniào wàikē, urological surgery). On its own as a verb it's clinical and rare in everyday speech —
小便 (xiǎobiàn) is the common word.
