Diameter

/dʌɪˈamɪtə/

Origin

1350–1400; Middle English diametre < Old French < Latin diametros < Greek diámetros diagonal, diameter, equivalent to dia- dia- + -metros, derivative of métron meter1 (Source: dictionary.com)

Late Middle English from Old French diametre, via Latin from Greek diametros (grammē) ‘(line) measuring across’, from dia ‘across’ + metron ‘measure’. (Source: lexico.com)

Definitions of Diameter

Diameter

noun

  1. 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.
  2. the length of such a line.
  3. the width of a circular or cylindrical object.
  4. 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
  5. the thickness of something, esp with circular cross section

dictionary.com

Diameter

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.

dictionary.com

Diameter

noun

  1. A straight line passing from side to side through the centre of a body or figure, especially a circle or sphere.
  2. A unit of linear measurement of magnifying power.

lexico.com

Diameter

noun

  1. : a chord (see chord entry 3 sense 2) passing through the center of a figure or body
  2. : the length of a straight line through the center of an object or space the diameter of a circle dug a hole nearly four feet in diameter
  3. : a unit of enlargement used with a number to indicate magnification by a lens or optical system an object one millimeter wide magnified 40 diameters appears 40 millimeters wide

merriam-webster.com

Example sentences for Diameter

  1. Kepler-186f is about 11 percent larger than Earth in diameter, which means it has nearly 25% more surface area.
  2. An array of whittled bamboo sticks, each four millimeters in diameter, makes up the two-room installation.
  3. The doctors discovered the entry wound into the frontal lobe with a diameter about equal to that of a cigarette.
  4. Using a 2-inch (5cm) diameter ring cutter, cut the scallops into straight cylinders; reserve the trim.
  5. Pi is officially defined as the ratio of the circumference of a circle to its diameter.
  6. Today the seven Centennial trees are about two feet in diameter and about 60 feet high.
  7. It is enveloped in a delicate vesicle, the diameter of which is very much greater than that of the contained ovum.
  8. Many of the pines on this ridge were two feet in diameter, and a hundred feet high, with small clusters of limbs around the tops.
  9. This lake was nearly round, and probably somewhat less than one-half mile in diameter.
  10. All along the side of the road extended an array of huge new pipes, some three feet in diameter, awaiting their turn underground.

Related words & Synonyms

width, breadth, bore, caliber, broadness, module

Nearby words

diamagnetism , diamantiferous , diamantina , diamantine , diamanté , diametral , diametric , diametrical , diametrically , diamide

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