octa-, octo-, oct-, octi-, octon-

A government by eight rulers; an aggregate of eight tribal or petty kingdoms each under its own ruler: applied by some historians (instead of heptarchy) to the eight kingdoms reckoned by them to have been established by the Angles and Saxons in Britain.

1. Occuring every eight years.
2. Lasting or taking eight years

1. A person who is in her/his eighties.
2. A person who is eighty to eighty-nines years old.

In botany, having eight pistils.