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# ellipse

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noun el·lipse \i-ˈlips, e-\

## Simple Definition of ellipse

• : a shape that resembles a flattened circle

Source: Merriam-Webster's Learner's Dictionary

## Full Definition of ellipse

1. 1 a :  oval b :  a closed plane curve generated by a point moving in such a way that the sums of its distances from two fixed points is a constant :  a plane section of a right circular cone that is a closed curve

2. 2

## Did You Know?

A closed curve consisting of points whose distances from each of two fixed points (foci) all add up to the same value is an ellipse. The midpoint between the foci is the center. One property of an ellipse is that the reflection off its boundary of a line from one focus will pass through the other. As a result, in an elliptical room, a person whispering at one focus is easily heard by someone at the other. An oval may or may not fit the definition of an ellipse.

## Origin and Etymology of ellipse

Greek elleipsis

First Known Use: circa 1753

## ellipse

play
noun el·lipse \i-ˈlips\

## Definition of ellipse for Students

1. :  a shape that looks like a flattened circle

## Seen and Heard

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

#### peculiar

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different from the usual or normal

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