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word element [Gr.], small; also used in naming units of measurement (symbol μ) to designate an amount one millionth (10−6) the size of the unit to which it is joined, e.g., microgram.
Miller-Keane Encyclopedia and Dictionary of Medicine, Nursing, and Allied Health, Seventh Edition. © 2003 by Saunders, an imprint of Elsevier, Inc. All rights reserved.


, micr- (mī'krō),
1. Prefixes denoting smallness.
2. Prefix used in the SI and the metric system to signify submultiples of one-millionth (10-6) of such unit.
3. chemistry prefix to terms denoting procedures that utilize minimal quantities of the substance to be examined; for example, a drop or two in place of 1 or more mL.
4. Combining forms meaning microscopic; opposite of macro-, megalo-.
[G. mikros, small]
Farlex Partner Medical Dictionary © Farlex 2012


, micr-
1. Prefixes denoting smallness.
2. Prefixes (abbrev. mc) used in the SI and metric system to signify one millionth (10-6) of a given unit.
3. chemistry Prefix to terms denoting chemical procedures or analyses that use minimal quantities of substance to be examined; specimen materials and reagents.
4. Combining form meaning microscopic; opposite of macro-,megalo-
[G. mikros, small]
Medical Dictionary for the Health Professions and Nursing © Farlex 2012