decimosexto

Century Dictionary and Cyclopedia

1. n. See sextodecimo.

Wiktionary

1. adj. Having sixteen leaves to a sheet.

GNU Webster's 1913

1. n. A book consisting of sheets, each of which is folded into sixteen leaves; hence, indicating, more or less definitely, a size of book; -- usually written 16mo or 16°.
2. adj. Having sixteen leaves to a sheet.