Definitions
parallel to or in the plane of the horizon or a base line
Word origin
Borrowed from Middle French horizontal, from horizon, horizonte, from Latin horizōn (stem horizont-).
Used in a sentence
“horizontal lines”
“As when the Sun new ris'n / Looks through the Horizontal misty Air”
“horizontal tango”
Source: Wiktionary, CC BY-SA 4.0
Used as a crossword answer1 curated clues
01“Level”10 letters
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H_________