'Sextodecimos' definitions:
Definition of 'Sextodecimos'
From: GCIDE
- Sextodecimo \Sex`to*dec"imo\, n.; pl. Sextodecimos. A book composed of sheets each of which is folded into sixteen leaves; hence, indicating, more or less definitely, a size of a book; -- usually written 16mo, or 16[deg]. [1913 Webster]