/ap'euhr tom"i teuhr/ , n. Optics.
an instrument for measuring the angular and numerical aperture of the objective lens of a microscope.
[ 1875-80; APERT(URE) + -O- + -METER ]
/ap'euhr tom"i teuhr/ , n. Optics.
an instrument for measuring the angular and numerical aperture of the objective lens of a microscope.
[ 1875-80; APERT(URE) + -O- + -METER ]
Random House Webster's Unabridged English dictionary. Полный английский словарь Вебстер - Random House . 2012