What is the medical term meaning liquid part of the blood?

Blood is 90-92% water, but what gives it the color is plasma.

• Plasma consists of: Dissolved substances including electrolytes such as sodium, chlorine, potassiun, manganese, and calcium ions;
• Blood plasma proteins (albumin, globulin, fibrinogen);

The blood plasma is the fluid that contains the contents of the blood, such as red blood cells, white blood cells, platelets, etc. 50% of blood is plasma, 48% is Red blood cells, Less than 2% is white blood cells, and less than 1% are platelets.

Plasma is the fluid portion of unclotted blood. After blood clots, the fluid that remains is referred to as serum. The fluid portion of the blood is called plasma.