IPA: /ˈfɛnɪstreɪt/
KK: /fɛnəˌstreɪt/
Having openings or windows; characterized by the presence of windows or similar structures.
The fenestrate design of the building allows for plenty of natural light.
Fenestrate → It is formed from "fenestra" (meaning window) and the suffix "-ate" (indicating to make or to provide with). The word "fenestrate" means to provide with windows or to perforate with openings like windows.
Think of 'fenestra' meaning window, and remember that to 'fenestrate' means to make something have windows or openings.