skyline
The line that seems to be the boundary of the sky and the ground; the horizon.
Other meanings
The horizontal silhouette of a city or building against the sky.
A path of movement, especially military movement, producing a silhouette above terrain features visible from the location of likely observers.
Example sentences
Where this comes from
This definition is adapted from “skyline” on Wiktionary, by its contributors; example sentences are from Tatoeba, credited to their authors above, published under CC BY-SA 4.0. This page is published under the same licence.