[oc.to.ge.nar.i.an] n [L octogenarius containing eighty, fr. octogeni eighty each, fr. octoginta eighty, fr. octo eight + -ginta (akin to viginti twenty)--more at vigesimal] (1815): a person whose age is in the eighties -- octogenarian adj
OCTOGENARIAN
Meaning of OCTOGENARIAN in English
Merriam-Webster English vocab. Английский словарь Merriam Webster. 2012