# parabola

[ puh-rab-uh-luh ]

/ pəˈræb ə lə /

### noun Geometry.

a plane curve formed by the intersection of a right circular cone with a plane parallel to a generator of the cone; the set of points in a plane that are equidistant from a fixed line and a fixed point in the same plane or in a parallel plane. Equation: y2 = 2px or x2 = 2py.

## QUIZZES

#### DON’T VACILLATE! VANQUISH THIS WORD OF THE DAY QUIZ!

It’d be a real faux pas to miss this quiz on the words from August 3–9, 2020!

Question 1 of 7

What does “vacillate” mean?

## Origin of parabola

1570–80; <New Latin <Greek parabolḗ an application. See parable

## Words nearby parabola

Dictionary.com Unabridged
Based on the Random House Unabridged Dictionary, © Random House, Inc. 2020

## Example sentences from the Web for parabola

## British Dictionary definitions for parabola

parabola

/ (pəˈræbələ) /

### noun

a conic section formed by the intersection of a cone by a plane parallel to its side. Standard equation: y ² = 4 ax, where 2 a is the distance between focus and directrix

## Word Origin for parabola

C16: via New Latin from Greek parabolē a setting alongside; see parable

Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

## Scientific definitions for parabola

parabola

[ pə-răb′ə-lə ]

The curve formed by the set of points in a plane that are all equally distant from both a given line (called the directrix) and a given point (called the focus) that is not on the line.

The American Heritage® Science Dictionary
Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

## Cultural definitions for parabola

parabola

[ (puh-rab-uh-luh) ]

A geometrical shape (see geometry) consisting of a single bend and two lines going off to an infinite distance.

## notes for parabola

The New Dictionary of Cultural Literacy, Third Edition
Copyright © 2005 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.