noun
microgram
A metric unit of mass equal to one millionth of a gram. Used in scientific and medical contexts.
この薬の有効成分は1錠あたり50マイクログラムです。
The active ingredient in this medicine is 50 micrograms per tablet.
大気中の水銀濃度は1立
The concentration of mercury in the air was a few micrograms per cubic meter.