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Meaning of seronegative

se•ro•neg•a•tive

Pronunciation: (sēr"ō-neg'u-tiv), [key]
— adj. Med.
  1. showing no significant level of serum antibodies, or other immunologic marker in the serum, that would indicate previous exposure to the infectious agent being tested.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.