Microgram is a term used to describe a small unit of measure in the metric system, equivalent to one-millionth of a gram. Synonyms for microgram include µg, mcg, and the abbreviated form of microgram, ug. These units are commonly used in scientific and medical fields to accurately measure small quantities of substances such as medications, hormones, and vitamins. It's important to accurately measure doses of these substances as even small variations can have significant effects on the human body. Understanding these synonyms is crucial for making sure that measurements are precise and accurate. So, whether you see µg, mcg, or ug, remember that they are all referring to the same unit of measure - microgram.