micro-

[Gr. μικρός small]. A prefix signifying small. micro-atrophile, micro-atrophilic, micro aérophilous (mi”kro-a’er-o-fil, -a-er-o-fil’ik, -a-erofil-us) (Gr. μεκρός small + céropkilous]. Requiring only a small amount of free oxygen: said of bacteria.