Meaning of duodecimo

du•o•dec•i•mo

Pronunciation: (d"u-des'u-mō", dy"-), [key]
— n., pl. adj. -mos,
—n.
  1. Also calleda book size of about 5 × 7 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.
  1. in duodecimo; twelvemo.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.