Science Dictionary
aberration  [%PREMIUM_LINK%]     (āb'ə-rā'shən)  Pronunciation Key 
  1. A deviation in the normal structure or number of chromosomes in an organism.

  2. A defect in a lens or mirror that prevents light rays from being focused at a single point and results in a distorted or blurred image. ◇ Aberration that results in distortion of color is called chromatic aberration. ◇ Aberration that is caused by imperfections in the surface or shape of a spherical mirror or lens is called spherical aberration. See also astigmatism, coma.2

The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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