{ Mi"cro- (?), Mi"cr- }. [Gr. mikro`s small.] A combining form signifying: (a) Small, little, trivial, slight; as, microcosm, microscope. (b) (Metric System, Elec., Mech., etc.) A millionth part of; as, microfarad, microohm, micrometer.

• Very small.
       micro-miniskirt
  
• In the International System of Units and other metric systems of units, multiplying the unit to which it is attached by 10-6. Symbol: μ (official), mc (unofficial).
       microgram
       
• Note: The symbol mc is used in non-scientific contexts where readers might not understand the official symbol μ. For example, on bottles of vitamin tablets, micrograms is often abbreviated to mcg.
  
  French
• micro- (very small)
  
• micro- (SI prefix)
  
  Italian
• micro- (very small)
  
• micro- (SI prefix)