adjective Medicine/Medical.
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.

1930–35; sero- + negative Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
seronegative (ˌsɪərəʊˈnɛɡətɪv)
(of a person whose blood has been tested for a specific disease, such as AIDS) showing no serological reaction indicating the presence of the disease

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American Heritage
Medical Dictionary

seronegative se·ro·neg·a·tive (sēr'ō-něg'ə-tĭv)
Having a negative reaction to a serological test for a disease, especially to a test for syphilis or AIDS.

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