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sixmo

British  
/ ˈsɪksməʊ /

noun

  1. Often written: 6mo.   6°.  Also called: sexto.  a book size resulting from folding a sheet of paper into six leaves or twelve pages, each one sixth the size of the sheet

  2. a book of this size

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Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023

Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.