OCTAVO
Oc*ta"vo, a.
Defn: Having eight leaves to a sheet; as, an octavo form, book, leaf, size, etc.
OCTENE
Oc"tene, n. Etym: [See Octo-.] (Chem.)
Defn: Same as Octylene.
OCTENNIAL Oc*ten"ni*al, a. Etym: [L. octennium a period of eight years; octo eight + annus year.]
Defn: Happening every eighth year; also, lasting a period of eight
years. Johnson.
— Oc*ten"ni*al*ly, adv.
OCTET
Oc*tet", n. Etym: [From L. octo eight, like E. duet, fr.L.duo. See
Octave.] (Mus.)
Defn: A composition for eight parts, usually for eight solo instruments or voices.
OCTIC
Oc"tic, a. Etym: [Octo- + -ic.] (Math.)
Defn: Of the eighth degree or order.
— n. (Alg.)