Dictionary![]() ![]() du•o•dec•i•moPronunciation: (dOO"u-des'u-mō", dyOO"-), [key] —n., pl. -mos, —adj. —n. 1. Also called twelvemo. a book size of about 5 × 7½ 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. in duodecimo; twelvemo. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.
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