partially engulfed particle

https://doi.org/10.1351/goldbook.14303
Multicomponent particle in which one or more polymer(s) cover(s) most, but not all, of the particle surface.
Note: The degree of coverage may vary when neither polymer is preferentially covering the other one. The morphology is commonly referred to as a hemisphere.
Source:
PAC, 2011, 83, 2229. (Terminology of polymers and polymerization processes in dispersed systems (IUPAC Recommendations 2011)) on page 2235 [Terms] [Paper]