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microgram

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WordReference Random House Unabridged Dictionary of American English © 2025

mi•cro•gram¹ n.

Chemistrya unit of mass or weight equal to one millionth of a gram, used chiefly in microchemistry. Symbol: μg Also,[esp. Brit.,] mi′cro•gramme′.

micro- + -gram² 1885–90

mi•cro•gram² n.

Opticsmicrograph (def. 2).

micro- + -gram¹

'microgram' also found in these entries (note: many are not synonyms or translations):

gamma - mcg - micro - ultramicrobalance - ultramicrochemistry

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