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apochromatic objective

(ăp′ə-krō-mătĭk)
n.
  1. An objective in which chromatic aberration is corrected for three colors and spherical aberration is corrected for two.
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The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.