IPA: /ˈskaɪlaɪt/
KK: /ˈskaɪˌlaɪt/
A window built into a roof that lets in natural light from above.
The living room was bright and airy thanks to the large skylight.
Skylight is formed from "sky" (from Old Norse *sky*, meaning cloud or sky) and "light" (from Old English *leoht*, meaning illumination or brightness). The word refers to a window or opening that allows light from the sky to enter a space.
Imagine a window that brings in 'light' from the 'sky' — that's what a skylight does.