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diameter

diameter

87 2.7
A straight line through the center of a circle or ball that reaches opposite sides, measured end to end
  • noun
  • /daɪˈæmətər/
translation icon : diámetro
  • The pipe has a diameter of 4 inches, making it suitable for the project.
  • diameter in inches
  • diameter in centimeters
  • diameter in millimeters

Make a perfectly round one inch diameter hole in the skull.

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Examples

  • The hole, she observes, is about five feet in diameter and four feet deep.

    Fiction book (1990)
  • An asteroid 12 miles in diameter struck the Earth.

  • Make sure that the diameter is exactly right.

  • The only table was round and four feet in diameter, covered with green felt.

    Fiction book (1993)
  • You need to dig about two times the diameter of the pot.

  • This island's about 10 miles in diameter?

  • The hole was nearly the diameter of his ring finger, and he tested the edge.

    Fiction book (1995)
  • It's approximately the diameter of a basketball, eye catching and easily retrievable.

  • lt's over 200 meters in diameter.

  • A vault door has 20 bolts, each an inch in diameter.

Synonyms

diam
vsdiameter
  • Specialized
6.9

The straight line across a circle through its center

is the full written term used instead of the shortened abbreviation

How Long

length
340 1.0
span
89 3.1
width
93 1.0
diameter
87 2.7
radius
112 3.6

Surface Forms

diameter singular
diameters plural

Morphology

diameter = meter (semi-transparent) = dia + meter

The elements 'dia-' and 'meter' are recognizable, but the mathematical sense is specialized and not fully predictable from the parts alone.

Etymology

Diameter comes from Greek parts dia- 'through' and metron 'measure'. So, a diameter is the 'measure' that goes 'through' a circle, the straight line across the middle that touches both edges. You can remember it by thinking of meter as a unit of measure.