what is a micro
1. Prefixes denoting smallness. 2. Prefix used in the SI and the metric system to signify submultiples of one-millionth (10-6) of such unit. 3. chemistry prefix to terms denoting procedures that utilize minimal quantities of the substance to be examined; for example, a drop or two in place of 1 or more mL. 4. Combining forms meaning microscopic; opposite of macro-, megalo-. micro-, micr-, mikro-. 1 prefix meaning small: microanalysis, microglossia.