subfluid
/sʌbˈfluɪd/
noun
- A fluid that is part of or beneath another fluid layer, especially in scientific or technical contexts.
- The subfluid in the tank was denser and settled below the main liquid.
- In the experiment, the subfluid layer remained cooler than the surface liquid.
- Geologists study the subfluid beneath the Earth's crust to understand magma movement.