
1) Littleness 2) Twelvemo
Found on
https://www.crosswordclues.com/clue/duodecimo

• (a.) Having twelve leaves to a sheet; as, a duodecimo from, book, leaf, size, etc. • (n.) A book consisting of sheets each of which is folded into twelve leaves; hence, indicating, more or less definitely, a size of a book; -- usually written 12mo or 12
Found on
http://thinkexist.com/dictionary/meaning/duodecimo/
Du`o·dec'i·mo adjective [ Latin
in duodecimo in twelfth, from
duodecimus twelfth ,
fr .
duodecim twelve. See
Dozen .] Having twelve leaves to a sheet; as, a
duodecimo from, book, leaf, size, etc.
Found on
http://www.encyclo.co.uk/webster/D/131
Du·o·dec'i·mo noun ;
plural Duodecimos A book consisting of sheets each of which is folded into twelve leaves; hence, indicating, more or less definitely, a size of a book; -- usually written 12mo or 12°.
Found on
http://www.encyclo.co.uk/webster/D/131

Duodecimo is a measure of paper in which each leaf forms a twelfth part of the sheet.
Found on
http://www.probertencyclopaedia.com/browse/AD.HTM

Description of the size of a book: about 7.75 inches high (12mo).
Found on
http://www.trussel.com/books/glossary.htm
No exact match found.