micro-

[G. mikros, small.] A prefix noting smallne . (i) When prefixed to a term denoting a imlt of any kind it denotes the one-millionth of such unit (the term micro millimeter is an exception, or rather is incorrect) (2) applied to words noting chemical examination, methods, etc., it means that minimal used—a quantities of the substance to be examined are drop or two, for example, in place of one or more cubic centimeters; see Bang's* method.