noun

diameter

diameter

The diameter of the circle is 10 centimeters.

The diameter of the circle is 10 centimetres.

They measured the diameter of the tree trunk.

They measured the diameter of the tree trunk.

the ((diameter)) of (sth.) The diameter of the circle is 10 cm.

Synonyms: width, breadth; Antonyms: radius, circumference

From Greek 'dia-' (across, through) and 'metron' (measure). It literally means 'measure across'.

Imagine measuring 'across' (dia-) a circle with a 'meter' stick.

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