# diameter

[dahy-am-i-ter]

- Geometry.
- a straight line passing through the center of a circle or sphere and meeting the circumference or surface at each end.
- a straight line passing from side to side of any figure or body, through its center.

- the length of such a line.
- the width of a circular or cylindrical object.

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## Origin of diameter^{}

Dictionary.com Unabridged
Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

## Examples from the Web for diameter

### Contemporary Examples

#### Kepler-186f is about 11 percent larger than Earth in diameter, which means it has nearly 25% more surface area.

#### An array of whittled bamboo sticks, each four millimeters in diameter, makes up the two-room installation.

#### The doctors discovered the entry wound into the frontal lobe with a diameter about equal to that of a cigarette.

#### Using a 2-inch (5cm) diameter ring cutter, cut the scallops into straight cylinders; reserve the trim.

#### Pi is officially defined as the ratio of the circumference of a circle to its diameter.

### Historical Examples

#### Lay a young birch or maple an inch or so in diameter across a log.

The ForestStewart Edward White

#### He employed a cylinder 12 centimeters in diameter fitted with a piston.

#### This island is very small, not above half a league in diameter.

The History of LouisianaLe Page Du Pratz

#### The clearing was a circle some two hundred yards in diameter.

The Bluff of the HawkAnthony Gilmore

#### The boom should be made a trifle smaller in diameter than the mast.

Boys' Book of Model BoatsRaymond Francis Yates

## diameter

- a straight line connecting the centre of a geometric figure, esp a circle or sphere, with two points on the perimeter or surface
- the length of such a line

- the thickness of something, esp with circular cross section

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## Word Origin

C14: from Medieval Latin diametrus, variant of Latin diametros, from Greek: diameter, diagonal, from dia- + metron measure

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

## Word Origin and History for diameter

Online Etymology Dictionary, © 2010 Douglas Harper

## diameter

(dī-ăm′ĭ-tər)- A straight line connecting two opposite points on the surface of a spherical or cylindrical body, or at the boundary of an opening or foramen, passing through the center of such body or opening.
- The distance measured along such a line.

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The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.

## diameter

[dī-ăm′ĭ-tər]

- A straight line segment that passes through the center of a circle or sphere from one side to the other.
- The length of such a line segment.

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

## diameter

[(deye-am-uh-tuhr)]

A straight line passing through the center of a figure, especially a circle or sphere, and joining two opposite points on its circumference.

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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.