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"Section M, N, and O"

;pl.
Octavos (#). [L. in octavo; in in +
octavo, abl. of octavus. See Octave.] A
book composed of sheets each of which is folded into eight leaves;
hence, indicating more or less definitely a size of book so made; --
usually written 8vo or 8°.


Oc*ta"vo, a. Having eight leaves
to a sheet; as, an octavo form, book, leaf, size,
etc.


Oc"tene (?), n. [See Octo-.]
(Chem.) Same as Octylene.


Oc*ten"ni*al (?), a. [L.
octennium a period of eight years; octo eight +
annus year.] Happening every eighth year; also, lasting a
period of eight years.
Johnson. --
Oc*ten"ni*al*ly, adv.


Oc*tet" (?), n. [From L. octo
eight, like E. duet, fr.L. duo. See Octave.]
(Mus.) A composition for eight parts, usually for eight
solo instruments or voices.


Oc"tic (?), a. [Octo- + -
ic
.] (Math.) Of the eighth degree or order.


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