diameter
noun /daɪˈæmɪtə(r)/
/daɪˈæmɪtər/
- a straight line going from one side of a circle or any other round object to the other side, passing through the centre
enlarge image- The diameter of the tree trunk was more than a metre.
- in diameter The dome is 42.3 metres in diameter.
Extra ExamplesTopics Colours and Shapesc1, Maths and measurementc1- The mirror is 25cm in diameter.
- The tubes have an internal diameter of 2 mm.
- a method of calculating the diameter of the earth
- The radius of a circle is half its diameter.
Oxford Collocations Dictionaryadjective- inner
- inside
- internal
- …
- calculate
- determine
- estimate
- …
- in diameter
- (specialist) a measurement of the power of an instrument to magnify something
- a lens magnifying 300 diameters (= making something look 300 times larger than it really is)
Word Originlate Middle English: from Old French diametre, via Latin from Greek diametros (grammē) ‘(line) measuring across’, from dia ‘across’ + metron ‘measure’.