Answer: sixteenmo

AnswerCrossword Clue
sixteenmoprinted, folded, or bound in sixteenmo; sextodecimo
sixteenmobook size (about 4x6 in.; 10x15 cm) determined by printing on sheets folded to form 16 leaves or 32 pages
sixteenmoa book size 55/8 x 43/8 in. (abbreviated as 16mo.) also SEXTODECIMO
sixteenmobook of this size. Symbol: 16mo, 16┬░