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n. pl. sex·to·dec·i·mos
1. The page size of a book composed of printer's sheets folded into 16 leaves or 32 pages.
2. A book composed of sextodecimo pages. In both senses also called sixteenmo.

[Latin sextōdecimō, ablative of sextusdecimus, one sixteenth : sextus, sixth; see s(w)eks in Indo-European roots + decimus, tenth (from decem, ten; see dekm̥ in Indo-European roots).]


n, pl -mos
(Printing, Lithography & Bookbinding) bookbinding another word for sixteenmo
[C17: from Latin sextusdecimus sixteenth]


(ˈsɪksˈtin moʊ)

n., pl. -mos.
1. Also called sextodecimo. a book size (about 4x6 in.; 10x15 cm) determined by printing on sheets folded to form 16 leaves or 32 pages.
2. a book of this size. Symbol: 16mo, 16°
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References in periodicals archive ?
The paper was folded into sextodecimo and docketed on the reverse of the final folio to read: "Martyrio d'alcuni Inglesi nel [sic] anno 1594.
Very careful examination of extant copies of the book allows Cohen to establish some new facts: for example, that while the book appears to be bound as octavo, its printing format is sextodecimo, and that Bridges' insistence on correcting some ill-reproduced photographs of Hopkins accounts for this book having two binding states.
4) Older books are traditionally categorized by decreasing size: folio, quarto, octavo, duodecimo, and sextodecimo.