Constitutional repeating unit of connectivity $c \ge 3$ connected to $c$ other constitutional repeating units.
See also: dendron
Source:
PAC, 2019, 91, 523. 'Nomenclature and terminology for dendrimers with regular dendrons and for hyperbranched polymers (IUPAC Recommendations 2017)' on page 528 (https://doi.org/10.1515/pac-2016-1217)