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n. pl. oc·to·dec·i·mos
1. The page size, 4 by 6.5 inches, of a book composed of printer's sheets folded into 18 leaves or 36 pages.
2. A book composed of octodecimo pages. In both senses also called eighteenmo.

[Late Latin (in) octōdecimō, (in) an eighteenth, ablative sing. of octōdecimus, eighteenth, from Latin octōdecim, eighteen : octō, eight; see oktō(u) in Indo-European roots + decem, ten; see dekm̥ in Indo-European roots.]


n, pl -mos
(Printing, Lithography & Bookbinding) bookbinding another word for eighteenmo
[C18: from New Latin phrase in octodecimo in an eighteenth (of a whole sheet)]
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AVAILABLE IN A RANGE OF FORMATS, from palm-sized octodecimos to octavos, compilations of exemplary "beauties" in prose or verse made ideal gift books in the eighteenth century; each volume was an edificatory vade mecum and together they formed an affordable library of compact classics.