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microgram or microgramme is equal to 10-6 gram (unit of mass), comes from a combination of the metric prefix micro (µ) with the gram (g). Plural name is micrograms.
centigram or centigramme is equal to 10-1 gram (unit of mass), comes from a combination of the metric prefix centi (c) with the gram (g). Plural name is centigrams.