equilateral

American  

[ee-kwuh-lat-er-uhl, ek-wuh-] / ˌi kwəˈlæt ər əl, ˌɛk wə- /

adjective

1. having all the sides equal.

   an equilateral triangle.

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noun

1. a figure having all its sides equal.

2. a side equivalent, or equal, to others.

equilateral British  

/ ˌiːkwɪˈlætərəl /

adjective

1. having all sides of equal length

   an equilateral triangle

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noun

1. a geometric figure having all its sides of equal length

2. a side that is equal in length to other sides

equilateral Scientific  

/ ē′kwə-lăt′ər-əl /

1. Having all sides of equal length, as a triangle that is neither scalene nor isosceles.

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Other Word Forms

• equilaterally adverb
• nonequilateral adjective
• nonequilaterally adverb
• subequilateral adjective
• unequilateral adjective
• unequilaterally adverb

Etymology

Origin of equilateral

From the Late Latin word aequilaterālis, dating back to 1560–70. See equi-, lateral

Example Sentences

These related tilings are made of shapes called polyiamonds, simple tiles formed by combining equilateral triangles.

From Scientific American

She added an equilateral oval line, slightly off-center within the disk’s perfect circle.

From Los Angeles Times

The equilateral cross with its legs bent at right angles is a millennia-old sacred symbol in Hinduism, Buddhism and Jainism that represents peace and good fortune.

From Washington Post

“You would be able to hear a square one. It would sound special. And the same thing for triangle drums: an equilateral triangle drum would sound special, not like any of the others.”

From Scientific American

There are love triangles here but, as in life, none are equilateral.

From New York Times

Related Words

• rectangular