twelvemo

twelve·mo

 (twĕlv′mō′)
n. pl. twelve·mos

twelvemo

(ˈtwɛlvməʊ)
n, pl -mos
(Printing, Lithography & Bookbinding) bookbinding another word for duodecimo

du•o•dec•i•mo

(ˌdu əˈdɛs əˌmoʊ, ˌdyu-)

n., pl. -mos,
adj. n.
1. a book size of about 5 x 7½ in. (13 x 19 cm), determined by printing on sheets folded to form 12 leaves or 24 pages. Symbol: 12 mo, 12°
2. a book of this size.
adj.
3. in duodecimo; twelvemo.
Also called twelvemo.
[1650–60; short for Latin in duodecimō in twelfth]
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References in periodicals archive ?
Other than this host of octavos and the twelve Elizabethan folios, we encounter fifty-seven quartos, seven twelvemos, thirteen sixteenmos, three thirtytwomos, and one broadside.