octuplicate

noun

1. a group, series, or set of eight identical copies (usually preceded by in).

adjective

2. having or consisting of eight identical parts; eightfold.
3. noting the eighth copy or item.

verb (used with object), oc·tu·pli·cat·ed, oc·tu·pli·cat·ing.

4. to make eight copies of.
5. to make eight times as great, as by multiplying.