The Collaborative International Dictionary
Fastigiated
Fastigiate \Fas*tig"i*ate\, Fastigiated \Fas*tig"i*a`ted\, a.
Narrowing towards the top.
(Bot.) Clustered, parallel, and upright, as the branches of the Lombardy poplar; pointed.
(Zo["o]l.) United into a conical bundle, or into a bundle with an enlarged head, like a sheaf of wheat.
Wiktionary
fastigiated
a. (alternative form of fastigiate English)