- Having sixteen leaves to a sheet; of, or equal to, the
size of one fold of a sheet of printing paper when folded so as to make
sixteen leaves, or thirty-two pages; as, a sextodecimo volume.
2 . Sextodecimo
[ n.]
- 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¡.