Medical Dictionary

aberration ab·er·ra·tion (āb'ə-rā'shən)

  1. A departure from the normal or typical.

  2. A psychological disorder or abnormal alteration in one's mental state.

  3. A defect of focus, such as blurring in an image.

  4. An imperfect image caused by a physical defect in an optical element, as in a lens.

  5. A deviation in the normal genetic structure or number of chromosomes in an organism.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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