microgram

noun

1. An SI unit of mass equal to 10⁻⁶ grams. Symbol: μg A unit of mass equal to one millionth of a gram, or 0.000 001 grams.

   “Holonyms: milligram < gram < kilogram < megagram < gigagram”

   “Meronyms: picogram < nanogram”

   “In the United States, there was a daily mortality increase of 0.79 percent for each 10 micrograms per cubic meter increase in PM 10 and a 1.58 percent increase for each 10 microgram increase in PM 2.5.”