If I'm reading your question right then the answer is solvent, with the "solid part" being the solute. This is not a good way to think about solvents and solutes however.
Solute is the solid part of the solution. Solvent is the liquid part of the solution.
Liquid
Blood is what a chemist would describe as an aqueous solution; the liquid part is simply water.
The liquid part is the solvent, and the dissolved solid is the solute.
A homogeneous mixture
Well, there is liquid everywhere in your body. The liquid part of blood is plasma. The liquid outside of the circulatory system and cells is the interstitial fluid. The liquid inside of your cells is called cytosol.
Blood is what a chemist would describe as an aqueous solution; the liquid part is simply water.
Liquid is a state of matter (liquid, solid, gas, plasma). A solution is a homogeneous mixture of particles in a liquid form (HCl, NaCl dissolved in water until the water is saturated or supersaturated, ect)
This solution is a liquid.
A solution is a mixture of a liquid and a liquid, or liquid and dissolved solids.
The solution of liquid is blank secret!
a play on words .. a solution in the form of a liquid