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titer Syllabification: ti·ter
Pronunciation: /ˈtīdər/
(British titre)

Definition of titer in English:


1The concentration of a solution as determined by titration.
Example sentences
  • Dialysis of the DNA resulted in acceptable titres.
  • The plate is incubated at 37° for 16-36 hr, and the titer of the colony-forming units is divided by the titer of the microscopic count to determine the viability.
  • Aliquots were withdrawn at the indicated times, the viable titer was determined, and the percentage of survivors was calculated.
1.1The minimum volume of a solution needed to reach the endpoint in a titration.
1.2 Medicine The concentration of an antibody, as determined by finding the highest dilution at which it is still able to cause agglutination of the antigen.
Example sentences
  • The antibody response was termed as group specific, species specific or cross reactive depending on the comparative antibody titres obtained against different antigen pools.
  • Patients in Stages III and IV showed a decline in the antiGDlb antibody titers in relation to neurological recovery following PE.
  • Influenza vaccination has produced substantial antibody titers against influenza in vaccinated HIV-infected persons who have minimal symptoms related to acquired immunodeficiency syndrome and high CD4 cell counts.


Mid 19th century: from French titre, from titrer (see titrate).

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