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An obsolete instrument once used for measuring the rate and degree of dark adaptation, as in vitamin "A" deficiency.
This entry is located in the following units:
bio-, bi-, -bia, -bial, -bian, -bion, -biont, -bius, -biosis, -bium, -biotic, -biotical
meter-, metro-, metr-, -metrical, -metrically, -metron, -metric, -metrist, -meter, -meters, -metry, -metre
photo-, phot-, -photic