vasopressin

This term refers to a specific peptide hormone, also known as antidiuretic hormone (ADH). In clinical settings, it is discussed primarily in the context of fluid homeostasis and blood pressure regulation. The term is used almost exclusively within medical, pharmacological, and biological registers.

As a chemical substance and hormone, it is treated as an uncountable noun. It does not have a plural form in standard medical usage, as it refers to the molecular entity rather than individual units.