eighteenmo

eight·een·mo

 (ā-tēn′mō)
n. pl. eight·een·mos

[From 18mo, abbr. of octodecimo.]

eighteenmo

(ˈeɪˈtiːnməʊ)
n, pl -mos
1. (Printing, Lithography & Bookbinding) Also called: octodecimo a book size resulting from folding a sheet of paper into 18 leaves or 36 pages. Often written: 18mo or 18°
2. (Printing, Lithography & Bookbinding) a book of this size
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