fastigiate /fæˈstɪd͡ʒ.i.ət/adjective 4noun 1forms 3 adjective4 •Erect and parallel.The branches of this species are fastigiate. •Having closely-bunched erect parallel branchesThis is a fastigiate variety. •Characterized by a fastigium, a cavity separating the intexine from the sexine near the endoaperture of a colporate pollen grain.The grains are 3-colporate and fastigiate. •(no longer used) Tapering to a pointWe ascended the top of that noted hill, called Roseberry, or Ounsberry Topping, the top whereof is fastigiate, like a sugar-loaf, and serves for a sea-mark […] — 1662 noun1 •A tree or shrub with erect, parallel branches.An evening spent with a good catalogue or gardening encyclopaedia will reveal an astonishingly wide range of both weepers and fastigiates. — 1971 formsfastigiates · more fastigiate · most fastigiate