[ab-sawrp-shee-om-i-ter, -zawrp-]
a photoelectric instrument for measuring the concentration of a substance, as a transparent solution, by its absorption of monochromatic light.

1875–80; absorpti(on) + -o- + -meter

absorptiometric [ab-sawrp-shee-uh-me-trik, -zawrp-] , adjective
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