hypo-phase

https://doi.org/10.1351/goldbook.H02928
The denser phase in an @E02301@ system. This term is often used when two non-aqueous phases are present or when the solvent is an aqueous phase.
See also:
epi-phase
Source:
PAC, 1993, 65, 2373. (Nomenclature for liquid-liquid distribution (solvent extraction) (IUPAC Recommendations 1993)) on page 2381 [Terms] [Paper]