vertical line


Definition of vertical line

: a line perpendicular to a surface or to another line considered as a base: such as
a : a line perpendicular to the horizon
b : a line parallel to the sides of a page or sheet as distinguished from a horizontal line
c : the direction of a plumb line : a line normal to the surface of still water

Love words?

You must — there are over 200,000 words in our free online dictionary, but you are looking for one that’s only in the Merriam-Webster Unabridged Dictionary.

Start your free trial today and get unlimited access to America's largest dictionary, with:

  • More than 250,000 words that aren't in our free dictionary
  • Expanded definitions, etymologies, and usage notes
  • Advanced search features
  • Ad free!

Learn More about vertical line

Statistics for vertical line

Cite this Entry

“Vertical line.” Dictionary, Merriam-Webster, Accessed 25 Oct. 2020.

Comments on vertical line

What made you want to look up vertical line? Please tell us where you read or heard it (including the quote, if possible).


Test Your Vocabulary

Namesakes Word Quiz

  • a citrus fruit possibly named after a person
  • Which of the following is a fruit named after a Moroccan seaport?
Spell It

Can you spell these 10 commonly misspelled words?

Syn City

Test Your Knowledge - and learn some interesting things along the way.

Love words? Need even more definitions?

Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!