dispersed phase

https://doi.org/10.1351/goldbook.14307
Phase constituted of particles of any size and of any nature dispersed in a continuous phase of a different composition.
Source:
PAC, 2011, 83, 2229. (Terminology of polymers and polymerization processes in dispersed systems (IUPAC Recommendations 2011)) on page 2236 [Terms] [Paper]