[ey-simp-tuh-mat-ik, ey-simp-]
showing no evidence of disease.

1930–35; a-6 + symptomatic

asymptomatically, adverb Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
asymptomatic (æˌsɪmptəˈmætɪk, eɪ-)
(of a disease or suspected disease) without symptoms; providing no subjective evidence of existence

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

"without symptoms," 1932, from a-, privative prefix, + symptomatic (see symptom).
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

asymptomatic a·symp·to·mat·ic (ā'sĭmp-tə-māt'ĭk)
Exhibiting or producing no symptoms.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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Example sentences
Until a randomized trial demonstrates that a screening test is beneficial, it
  should not be used on asymptomatic people.
It will be even harder to persuade the asymptomatic to pop a daily pill or two
  for the public good.
Metabolic profiles based on certain molecules in the blood could enable earlier
  detection of this asymptomatic malignancy.
Adults usually do not show symptoms and are known as asymptomatic.
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