[ dʌɪ'amɪtə ]
■ noun
1》 a straight line passing from side to side through the centre of a body or figure, especially a circle or sphere.
↘a transverse measurement of something; width or thickness.
2》 a unit of linear measurement of magnifying power.
Derivatives
diametral adjective
Origin
ME: from OFr. diametre , via L. from Gk diametros (grammē) '(line) measuring across'.