micron(redirected from micra)
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Former term for micrometer.
Farlex Partner Medical Dictionary © Farlex 2012
micronA unit of length equal to 10–6 m.
Segen's Medical Dictionary. © 2012 Farlex, Inc. All rights reserved.
Former term for the measurement now termed a micrometer.
Medical Dictionary for the Health Professions and Nursing © Farlex 2012
Collins Dictionary of Biology, 3rd ed. © W. G. Hale, V. A. Saunders, J. P. Margham 2005
An SI unit of length equal to one millionth of a metre (10−6 m). Symbol: μm. Syn. micron (obsolete term). See nanometre.
Millodot: Dictionary of Optometry and Visual Science, 7th edition. © 2009 Butterworth-Heinemann
mi·cro·me·ter(mcm) (mīkrō-mētĕr, mī-kromĕ-tĕr)
1. One millionth of a meter; formerly called a micron.
2. A device for measuring various objects in an accurate and precise manner.
3. In medicine and biology, the term is usually used with reference to a glass slide or lens that is accurately marked for measuring microscopic forms.
[micro- + G. metron, measure]
Medical Dictionary for the Dental Professions © Farlex 2012