micro-organism

n organism so small that it can be seen only under a microscope 微生物.

mg, Mgr, MHz, mi, mi (also me), MI5, MI6, Miami, miaow, miasma, mica, mice, Michaelmas, Michaelmas daisy, Michigan, mick, mickey, micro, micro-, micro-electronics, microbe, microbiologist, microbiology, microcassette, microchip, microcomputer, microcosm, microdot, microeconomics, microelectronics, microfiche, microfilm, microform, microlight, micrometer, micron, microorganism, microphone, microprocessor, microscope,