Is “Duodecimo” a Scrabble word?
Yes
DUODECIMO
Valid in at least one Scrabble dictionary
Valid in these dictionaries
SOWPODS / CSW
Scrabble UK & International
TWL / NWL
Scrabble North America
Large English Dictionary
General English word list
Meaning of Duodecimo
noun
1.A size of paper, so called because it is originally made by folding and cutting a single sheet from a printing press into 12 leaves; (5 by 7¾ inches): 6.5 to 7.5 inches high, approximately 4.5 inches wide.
2.A sheet or page of that size.
3.A book having pages of that size.
Synonyms: 12mo, 12º, D, twelvemo, 12mo, 12º