We don't have synonyms for duodecimos yet — it may be a rare, specialized, newly coined, or misspelled word. The closest thesaurus entries we have are duodecimal, duodecimo and duodecimals.
(n) :
(printing) A book having pages of that size.
(n) :
(paper, printing) A size of paper, so called because it is originally made by folding and cutting a single sheet from a printing press into 12 leaves; (5 by 7¾ inches): 6.5 to 7.5 inches high, approximately 4.5 inches wide.
(n) :
(printing) A book having pages of that size.
(n) :
(paper, printing) A size of paper, so called because it is originally made by folding and cutting a single sheet from a printing press into 12 leaves; (5 by 7¾ inches): 6.5 to 7.5 inches high, approximately 4.5 inches wide.