DictionaryhorizonSky boundary
noun

horizon

huh-RY-zuhn/həˈraɪzn/

The visible boundary where land or sea appears to meet the sky.

The sea seems to meet the sky at the horizon.

Sea meets sky at horizon.
Etymology

The Greek term meant “bounding circle”: the horizon marks the boundary of the visible earth or sea. This image connects a limit of sight with the apparent meeting of land or water and sky.

In context

Mango Earth0:30
The horizon stretches forever, a world stripped of color, where the line between earth and sky blurs into one.
Unseen Antarctica | Exploring The Buried Relics of a Lost Polar Civilization

More examples

  • The sun sinks below the horizon.
  • Dark clouds gather on the horizon beyond the fields.
  • She watches a distant ship disappear over the horizon.

Forms

horizon · horizons

horizontal adjective — Level and parallel to the horizon.

Similar words

skyline
The outline of buildings or hills against the sky.