diameter

noun

/daɪˈæmɪtə(r)/

/daɪˈæmɪtər/

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a straight line going from one side of a circle or any other round object to the other side, passing through the centre
- The diameter of the tree trunk was more than a metre.
- in diameter The dome is 42.3 metres in diameter.
compare radius
Extra Examples
- 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.
Topics Colours and Shapesc1, Maths and measurementc1
Oxford Collocations Dictionary
adjective
- inner
- inside
- internal
- …
verb + diameter
- calculate
- determine
- estimate
- …
preposition
- in diameter
See full entry
(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’.

单词	diameter
释义	diameter noun /daɪˈæmɪtə(r)/ /daɪˈæmɪtər/ jump to other results enlarge image a straight line going from one side of a circle or any other round object to the other side, passing through the centre The diameter of the tree trunk was more than a metre. in diameter The dome is 42.3 metres in diameter. compare radius Extra Examples 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. Topics Colours and Shapesc1, Maths and measurementc1 Oxford Collocations Dictionaryadjective inner inside internal … verb + diameter calculate determine estimate … preposition in diameter See full entry (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’.
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