venosity

from The American Heritage® Dictionary of the English Language, 5th Edition.

• noun The quality or condition of being venous.

from The Century Dictionary.

• noun Venose state, quality, or character.
• noun A condition in which the arterial blood is imperfectly oxygenated, and partakes of some of the characteristics of venous blood.
• noun A disturbance of equilibrium between the two circulatory systems, the veins being unduly filled at the expense of the arteries; general venous congestion.

from the GNU version of the Collaborative International Dictionary of English.

• noun The quality or state of being venous.
• noun (Med.) A condition in which the circulation is retarded, and the entire mass of blood is less oxygenated than it normally is.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun The quality of being venous or venose.
• noun A condition in which the circulation is retarded, and the entire mass of blood is less oxygenated than it normally is.