micro-

micro- or micr-

pref.

1.

a. Small: microcircuit.

b. Abnormally small: microcephaly.

c. Requiring or involving microscopy: microsurgery.

2. One-millionth (10^-6): microampere.

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[Greek mkro-, from mkros, small.]

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micro- or micr-

combining form

1. small or minute: microdot

2. involving the use of a microscope: microscopy

3. denoting 10^-6: microsecond [Greek mikros small]

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micro-

A prefix that means: "small" (as in microorganism) or "one millionth" (as in microsecond).