microgram
nounUK /ˈmaɪ.krə.ɡræm/
US /ˈmaɪ.kroʊ.ɡræm/
A microgram is a very tiny amount of weight, like a speck of dust.
The medicine contains just one microgram of the active ingredient.
OTHER MEANINGS
2. A unit of mass equal to one millionth of a gram, used in science and medicine.
The lab measured the vitamin level in micrograms per liter.
3. A symbol or abbreviation (µg) used on labels to show very small quantities.
The supplement label lists 5 µg of vitamin D.
4. A very small, almost invisible quantity of something.
There was not a microgram of doubt in her mind.