intertrial
adjective
in·ter·tri·al ˈin-tər-ˌtrī(-ə)l 
variants or less commonly inter-trial
: occurring or existing between two or more scientific trials (such as drug trials)
effects observed during the intertrial interval
Word History
First Known Use
1945, in the meaning defined above
Medical Definition
intertrial
adjective
in·ter·trial ˌint-ər-ˌtrī(-ə)l
: of, relating to, or being an interval between trials of an experiment