dioptre

US diopter

/ (daɪˈɒptə) /

noun

a unit for measuring the refractive power of a lens: the reciprocal of the focal length of the lens expressed in metres

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Derived forms of dioptre

dioptral, adjective

Word Origin for dioptre

C16: from Latin dioptra optical instrument, from Greek, from dia- through + opsesthai to see
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012