This is the 8160th most frequent Japanese word.
尿
Urine.
Here, "尿" is used in the context of medical testing, explicitly referring to the bodily fluid analyzed during the tests.
私は毎日尿検査をしています。
I undergo urine tests every day.
"尿" in this case is used to refer to the fluid as employed in animal behavior studies, indicating its ecological and biological role.
動物の尿はその縄張りを示すために使われることがあります。
Animals may use urine to indicate their territory.
In this sentence, "尿" is discussed conceptually as an indicator of health, highlighting its diagnostic significance.