unˈbranching,ppl.a. (un-1 10.) 1774Goldsm.Nat.Hist. III. iii. 80 The other has black unbranching hollow horns that never fall.1826Kirby & Sp.Entomol. III. xxviii. 12 He has made the first deviation from the beaten track of an unbroken and unbranching series.