horizontal
UK: ˌhɒrɪˈzɒntəl | US: ˌhɔːrɪˈzɑːntəl
adj. parallel to the plane of the horizon; level
adj. relating to or situated near the horizon
n. a horizontal line, plane, or direction
The word "horizontal" derives from the Late Latin horizontem (nominative horizon), meaning "boundary" or "limit," originally from the Greek horizōn kyklos ("limiting circle"). The suffix "-tal" (from Latin -alis) forms adjectives meaning "pertaining to." Thus, "horizontal" literally means "pertaining to the horizon," reflecting its geometric sense of alignment parallel to the earth's apparent boundary.
The artist drew a horizontal line across the canvas.
Lay the board in a horizontal position for stability.
The horizon appears perfectly horizontal at sea.
Adjust the shelf to ensure it is completely horizontal.
Horizontal stripes can make a room look wider.