'Duodecimos' definitions:
Definition of 'Duodecimos'
From: GCIDE
- Duodecimo \Du*o*dec"i*mo\, n.; pl. 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[deg]. [1913 Webster]