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