/dooh'euh des"euh moh', dyooh'-/ , n. , pl. duodecimos , adj.
n.
1. Also called twelvemo . a book size of about 5 × 7 1 / 2 in. (13 × 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.
[ 1650-60; short for L in duodecimo in twelfth ]