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 12ยก.
Similar Words:
Duodecahedral Duodecahedron Duodecennial Duodecimal Duodecimfid Duodecimo Duodecimos Duodecuple Duodenal Duodenary