Definition of fastigiate in US English:

fastigiate

adjective

Botany
  • (of a tree or shrub) having the branches sloping upward more or less parallel to the main stem.

    • ‘However, unlike planate, caroid, fastigiate, and linteloid plates, this inversion cannot be applied to camerate plates as indicated in de Verteuil and Norris.’

Origin

Mid 17th century: from Latin fastigium ‘tapering point, gable’ + -ate.

Pronunciation

fastigiate

/fəˈstijēət//fəˈstɪdʒiət/