The word anatomy comes from the Greek ana-meaning up or through + tome meaning a cutting. Anatomy was once a cutting up because the structure of the body was originally learned through dissecting it. The word histology came from the Greek histo- meaning tissue + logos, treatise.
Definition: Reliability is the degree to which a measurement instrument gives the same results each time that it is used, assuming that the underlying thing being measured does not change.
Reliability of the test is measure of the precision of a test which is done through measuring the wideth of confidence intervals for the measures of accurracy. Sensitivity and specificity a long side with the 2 predictive values are measures of validity of screening test .