Wiktionary
absorptiometer
n. 1 A instrument that computes the absorption rate by measuring the pressure of the gas; a colorimeter for liquids. (First attested in the late 19th century.)(R:SOED5: page=9) 2 An instrument used to measure the amount of radiation or light absorbed. (First attested in the mid 20th century.)
Usage examples of "absorptiometer".
There were no late-twentieth-century gadgets such the Single Photon Absorptiometer or scintillation detectors to estimate height based on the length of the humerus, radius, ulna, femur, tibia, and fibula - the long bones of the arms and legs.