LEARNit Dictionary
diameter
noun
/daɪˈæmɪtə(r)/
UK
/daɪˈæmɪtər/
US
1
a straight line going from one side of a circle or any other round object to the other side, passing through the centre
قطر, قطر دایره
compare
radius
2
a measurement of the power of an instrument to magnify something
قطر
a lens magnifying 300 diameters