sextodecimo

• ⇰ 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>as, a <ex>sextodecimo</ex> volume</as>.

• ⇰ 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;.