What does it mean for substances to be immixed?

In the context of a mixture, "immixed" refers to a substance that has been thoroughly mixed with another substance or substances to form a homogeneous mixture.

For example, if you have a mixture of sugar and salt, the sugar and salt are immixed because they are evenly distributed throughout the mixture and cannot be easily distinguished from one another. In contrast, if you have a mixture of sugar and sand, the sugar and sand are not immixed because the sand is not evenly distributed throughout the mixture and can be easily identified as separate particles.

The term "immixed" is often used in scientific and technical contexts to describe the degree of mixing that has occurred in a mixture. For example, a mixture might be described as "well-immixed" or "poorly-immixed" depending on the extent to which the components are mixed together.