octogamy

Noun

octogamy (uncountable)

1. The state of having eight spouses simultaneously.
   • I regret to say John has never had that pleasure yet; but if the "Honourable" Herbert D'Aulnoy should darken my doors again, I should feel it my duty to communicate certain facts about him to Sir Richard Mayne and Mr. Pollaky, and to ensure his conviction for bigamy, trigamy, quadrigamy, or perhaps...1865 March 25, Vere Haldane, “'Would-Be Wives, Beware!': A Caution Founded On Fact”, in Once A Week, page 378
   • The best wardmaster in Scutari had eight wives—I mean eight wives alive—at different stations. […] He was tried when he came home at Warwick Assizes for what was euphoniously called bigamy, but was octogamy.1888, Florence Nightingale, letter to Maude Verney dated 2 February 1888, published in Lynn McDonald, Florence Nightingale: An Introduction to Her Life and Family (2010), page 713