Diameter Definition & Meaning | Britannica Dictionary (original) (raw)

Britannica Dictionary definition of DIAMETER

1

[count]

:

a straight line from one side of something (such as a circle) to the other side that passes through the center point

• The dotted line indicates the diameter of the circle.

— see picture at geometry

2

:

the distance through the center of something from one side to the other

[count]

• What is the diameter of the tree trunk?
• a pipe with a diameter of two inches = a pipe with a two-inch diameter

[noncount]

• Dig a hole that's two feet deep and three feet in diameter.

— compare radius