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# diameter

[ dahy-**am**-i-ter ]

## noun

*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.

diameter

/ daɪˈæmɪtə /

## noun

- 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

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.

diameter

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

## Word History and Origins

Origin of diameter^{1}

*Middle English*

*diametre,*from

*Old French,*from

*Latin*

*diametros,*from

*Greek*

*diámetros*“diagonal, diameter,” from

*dia-*dia- +

*-metros,*derivative of

*métron*meter

^{1}

## Word History and Origins

Origin of diameter^{1}

*diametrus,*variant of Latin

*diametros,*from Greek: diameter, diagonal, from dia- +

*metron*measure

## Example Sentences

I also like a slightly wider tire over the stock rubber, but I usually only get an inch larger diameter tire.

For now, the team plans to set the diameter of the cones by hand.

Both are tiny—Phobos, the larger, is 14 miles in diameter, scarcely bigger than Manhattan Island—but they also circle extremely close to the planet.

In contrast, a raindrop’s diameter can be 20 to 30 times that size.

Those deep sockets can increase the eye’s visual ability without increasing its diameter.

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.

In cross-section the burrows varied from round (three inches in diameter) to oval (three inches high and four inches wide).

Reckoning that Neptune is the outermost planet of the solar system, that system would have a diameter of 5,584 millions of miles.

I think 6½ feet diameter for the fly, and 9½ inches diameter for the small wheel, will give speed enough to the drum.

The organism is an actively motile spiral thread, about four times the diameter of a red corpuscle in length.

The care shown in rearing insures a perfect straightness of stem, and an equable diameter of about an inch or an inch and a half.

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