What is Sub-Material? Meaning & Examples

[mymachine]

What is meant by the sub-material?

Such as if you mix three differential materials, for example, coffee + sugar + water, which one them is the sub-material?

Thank you

 

[Danger]

I shouldn't even be in this thread, because I know almost nothing of chemistry, but I have to ask what you mean by "sub-material". I've never heard that term before.
In the case that you cited, the water would be the solvent and the other two solutes. I guess that the solvent would be the liquid equivalent of a "substrate" such as the silicon in a microchip, but I somehow suspect that you refer to something else entirely.