/siks"teen"moh/ , n. , pl. sixteenmos , adj.
n.
1. Also called sextodecimo . a book size (about 4×6 in.; 10×15 cm) determined by printing on sheets folded to form 16 leaves or 32 pages.
2. a book of this size. Symbol: 16mo, 16°
adj.
3. printed, folded, or bound in sixteenmo; sextodecimo.
[ 1840-50; SIXTEEN + -MO ]