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forty-eightmo

[fawr-tee-eyt-moh] /ˈfɔr tiˈeɪt moʊ/
noun, plural forty-eightmos for 2.
1.
a book size of about 2½ × 4 inches (6 × 10 cm), determined by printing on sheets folded to form 48 leaves or 96 pages.
Abbreviation: 48mo, 48°.
2.
a book of this size.
adjective
3.
in forty-eightmo.
Origin
1885-1890
1885-90; forty-eight + -mo
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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