Webster’s Revised Unabridged Dictionary · 1913
Fastigiate
Fas·tig′i·ate, Fas·tig′i·a′ted, a. [L. fastigium gable end, top, height, summit.] 1. Narrowing towards the top.
2. (Bot.) Clustered, parallel, and upright, as the branches of the Lombardy poplar; pointed.
3. (Zoöl.) United into a conical bundle, or into a bundle with an enlarged head, like a sheaf of wheat.