https://doi.org/10.1351/goldbook.B00729
A
constitutional unit
containing a branch point
.Note:
A branch unit from which linear chains emanate may be termed an f-functional branch unit, e.g. five-functional branch unit. Alternatively, the terms trifunctional, tetrafunctional, pentafunctional, etc. may be used, e.g. pentafunctional branch unit.
A branch unit from which