Highly branched oligomer molecule, the constitutional repeating units of which are in substantial part branch constitutional repeating units and terminal constitutional repeating units.
See also: hyperbranched macromolecule (notes)
Source:
PAC, 2019, 91, 523. 'Nomenclature and terminology for dendrimers with regular dendrons and for hyperbranched polymers (IUPAC Recommendations 2017)' on page 532 (https://doi.org/10.1515/pac-2016-1217)