TITER

n. amount of a substance that is required in order to complete a reaction in a solution (Chemistry)

A titer (or titre) is the unit in which the analytical detection of many substances is expressed. It is the result of a titration. Generally, the test is performed on an undiluted sample, and then repeated when the sample is mixed with 100% water, saline, or other diluent in repeated steps (a serial dilution). If the test is still positive, then high titers of the detected substance are said to be present.
See more at Wikipedia.org...

Noun
1. the concentration of a solution as determined by titration
(synonym) titre
(hypernym) concentration

n. titer, amount of a substance that is required in order to complete a reaction in a solution (Chemistry)

trite