# diameter

[dahy-am-i-ter] /daɪˈæm ɪ tər/
noun
1.
Geometry.
1. a straight line passing through the center of a circle or sphere and meeting the circumference or surface at each end.
2. a straight line passing from side to side of any figure or body, through its center.
2.
the length of such a line.
3.
the width of a circular or cylindrical object.
Origin of diameter
1350-1400
1350-1400; Middle English diametre < Old French < Latin diametros < Greek diámetros diagonal, diameter, equivalent to dia- dia- + -metros, derivative of métron meter1
Can be confused
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2016.
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Examples from the Web for diameter
Contemporary Examples
• Two small openings roughly equal to the diameter of a matchstick are left for urination and menstruation respectively.

• Using a rolling pin or your fingers roll or press the dough out to an even circle about 11 to 12 inches in diameter.

January 5, 2011
• The reenvisioned design will measure 24 centimeters in diameter and will retail for a cool \$2,400.

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

January 23, 2014
• Kepler-186f is about 11 percent larger than Earth in diameter, which means it has nearly 25% more surface area.

Historical Examples
• Why it's an enormous altitude, my dear friend, if you compare it with the Moon's diameter.

Jules Verne
• The feet are sixteen feet long, and the arms six feet in diameter.

Oliver Optic
• The Mandan circular community house was usually about 14 feet in diameter.

Lewis Spence
• He cut in two a stick eighteen centimeters in diameter in eighteen minutes.

William Graham Sumner
• The tilting ring, suspended from the top of the arch, was not more than an inch in diameter.

Frank Gee Patchin
British Dictionary definitions for diameter

## diameter

/daɪˈæmɪtə/
noun
1.
1. a straight line connecting the centre of a geometric figure, esp a circle or sphere, with two points on the perimeter or surface
2. the length of such a line
2.
the thickness of something, esp with circular cross section
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
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Word Origin and History for diameter
n.

late 14c., from Old French diametre, from Latin diametrus, from Greek diametros (gramme) "diagonal of a circle," from dia- "across, through" (see dia-) + metron "a measure" (see meter (n.2)).

Online Etymology Dictionary, © 2010 Douglas Harper
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diameter in Medicine

diameter di·am·e·ter (dī-ām'ĭ-tər)
n.

1. 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.

2. The distance measured along such a line.

The American Heritage® Stedman's Medical Dictionary
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diameter in Science
 diameter   (dī-ām'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.
The American Heritage® Science Dictionary
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diameter in Culture
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.

The American Heritage® New Dictionary of Cultural Literacy, Third Edition
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diameter in Technology

The diameter of a graph is the maximum value of the minimum distance between any two nodes.

The Free On-line Dictionary of Computing, © Denis Howe 2010 http://foldoc.org
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### Difficulty index for diameter

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### Word Value for diameter

11
12
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