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Meaning of forty-eightmo

for•ty-eight•mo

Pronunciation: (fôr'tē āt'mō), [key]
— n., pl. adj. -mos
—n.
  1. a book size of about 2 × 4 in. (6 × 10 cm), determined by printing on sheets folded to form 48 leaves or 96 pages. Abbr.: 48mo, 48°
  2. a book of this size.
—adj.
  1. in forty-eightmo.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.