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Meaning of milligram-hour

mil•li•gram-hour

Pronunciation: (mil'i-gram"our", -ou"ur), [key]
— n. Radiotherapy.
  1. a unit of measure for a dose of radium expressed as the amount of radiation received by exposure to one milligram of radium for one hour.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.