Medical Dictionary

affinity af·fin·i·ty (ə-fĭn'ĭ-tē)

  1. An attraction or force between particles that causes them to combine.

  2. The attraction between an antigen and an antibody.

  3. A relationship or resemblance in structure between species that suggests a common origin.

  4. The selective staining of a tissue by a dye. The selective uptake of a dye, chemical, or other substance by a tissue.

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