intertrial

adjective
in·​ter·​tri·​al | \ˈin-tər-ˌtrī(-ə)l \
variants: or less commonly inter-trial

Definition of intertrial 

: occurring or existing between two or more scientific trials (such as drug trials) effects observed during the intertrial interval

First Known Use of intertrial

1945, in the meaning defined above

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The first known use of intertrial was in 1945

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intertrial

adjective
in·​ter·​trial | \ˌint-ər-ˌtrī(-ə)l \

Medical Definition of intertrial 

: of, relating to, or being an interval between trials of an experiment

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