Horizontal
Horizontal adjective - Parallel to or in the plane of the horizon or a base line.
Usage example: a horizontal surface
Perpendicular is an antonym for horizontal.
Nearby Words: horizontally, Horizonte
Perpendicular
Perpendicular adjective - At right angles to the plane of the horizon or a base line.
Usage example: measure the perpendicular height
Horizontal is an antonym for perpendicular in at right angles to topic.
Nearby Words: perpendicularity, perpendicularly
Both words in one sentence
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Vampires have the vertical and horizontal crosswired in their visual cortex, which causes them to suffer fatal seizures upon seeing perpendicular lines.
Source: Literature / Blindsight -
The pellets shot fire more pellets in a horizontal perpendicular path either at intervals or when it hits a surface or enemy.
Source: Recursive Ammo
Cite this Source
Perpendicular and Horizontal. (2016). Retrieved 2026, July 21, from https://thesaurus.plus/related/horizontal/perpendicular
Horizontal & Perpendicular. N.p., 2016. Web. 21 Jul. 2026. <https://thesaurus.plus/related/horizontal/perpendicular>.
Perpendicular or Horizontal. 2016. Accessed July 21, 2026. https://thesaurus.plus/related/horizontal/perpendicular.
Google Ngram Viewer shows how "horizontal" and "perpendicular" have occurred on timeline