sixteenmo

This series starts out bravely in Latin (quarto, octavo), but begins to falter a bit when it gets to 16mo (sextodecimo/sixteenmo), & finally tails off into English.

On twoth DC 2008

The fineness of the new type, as has been suggested, called for a smaller size of book, which was also favored by considerations of economy and convenience; and so Aldus made up his sheets in a form which the fold compels us to call octavo, but which to-day would be called sixteenmo.

The Booklover and His Books Harry Lyman Koopman 1898

The printed page is relatively wide, and the whole effect of the book is that of a tiny quarto, though in reality the dimensions are those of a rather small sixteenmo of normal proportions.

The Booklover and His Books Harry Lyman Koopman 1898

The mention of any size, folio, quarto, octavo, twelvemo, sixteenmo, calls up at once a distinct mental picture of an ideal book for each dimension, and the series is marked by a decreasing thickness of paper and size of type as it progresses downward from the folio.

The Booklover and His Books Harry Lyman Koopman 1898

In all candor I must say that she approached closely to a realization of the ideals of a book -- a sixteenmo, if you please, fair to look upon, of clear, clean type, well ordered and well edited, amply margined, neatly bound; a human look whose text, as represented by her disposition and her mind, corresponded felicitously with the comeliness of her exterior.

The Love Affairs of a Bibliomaniac 1896

In all candor I must say that she approached closely to a realization of the ideals of a book -- a sixteenmo, if you please, fair to look upon, of clear, clean type, well ordered and well edited, amply margined, neatly bound; a human book whose text, as represented by her disposition and her mind, corresponded felicitously with the comeliness of her exterior.

The Love Affairs of a Bibliomaniac Eugene Field 1872

a century and a half earlier by Aldus, but since that time very generally lost sight of by the later publishers, initiated a number of series of books in small and convenient forms, twelvemo and sixteenmo, which were offered to book buyers at prices considerably lower than those they had been in the habit of paying for similar material printed in folio, quarto, or octavo ....

The Booklover and His Books Harry Lyman Koopman 1898