DUODECIMO
Etymology
Noun
duodecimo (plural duodecimos)
(paper, printing) A size of paper, so called because it is originally made by folding and cutting a single sheet from a printing press into 12 leaves; (5 by 7¾ inches): 6.5 to 7.5 inches high, approximately 4.5 inches wide.
A sheet or page of that size.
(printing) A book having pages of that size.
Synonyms
• (paper size): twelvemo, 12mo, 12º
• (book size): twelvemo, 12mo, 12º, D
Source: Wiktionary
Du`o*dec"i*mo, a. Etym: [L. in duodecimo in twelfth, fr. duodecimus
twelfth, fr. duodecim twelve. See Dozen.]
Definition: Having twelve leaves to a sheet; as, a duodecimo from, book,
leaf, size, etc.
Du*o*dec"i*mo, n.; pl. Duodecimos (.
Definition: 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 12º.
Source: Webster’s Unabridged Dictionary 1913 Edition