horizontal line
Americannoun
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a line that is parallel to the base of a surface or plane. Compare vertical line.
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Mathematics. a line whose points all have the same vertical coordinate.
Other Word Forms
Noun Inflected Forms
Example Sentences
Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.
If gold was an effective hedge against inflation — if it protected your purchasing power — that chart would be a reasonably stable horizontal line from left to right.
From MarketWatch ● Oct. 14, 2025
Close inspection also shows a faint horizontal line bisecting each Milky Way star, which is caused by light bending around a support strut of the telescope’s secondary mirror.
From Scientific American ● Nov. 3, 2023
After reading about the science of math movement, she became more explicit about things that she assumed students understood, like how the horizontal line in a fraction means the same thing as a division sign.
From Seattle Times ● Sep. 12, 2023
“Once you grasp the vowels, you can get your tongue around most of the words — long sounds, short sounds, the macron,” the horizontal line above a vowel that indicates a stressed syllable, he said.
From New York Times ● Jul. 16, 2023
A vertical line went under the horizontal line on the right side of the board.
From "P.S. Be Eleven" by Rita Williams-Garcia
Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023
Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.
