DUCK’S BILL.

A tongue cut in a piece of stout paper, which is pasted on the tympan at the bottom of the tympan sheet, to support the white paper when working, instead of pins; the paper to be printed rests in the slit behind the tongue, and takes a good bearing.

It is seldom used except in the best work, where the paper printed is fine, stout, large, and expensive, when extra precautions are taken to prevent waste.

DUODECIMO.

The size of a book, generally for shortness written 12mo, and hence frequently incorrectly so pronounced. It is formed by folding a sheet of paper into twelve portions or leaves, making twenty-four pages. See Imposing.