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Meaning of octodecimo

oc•to•dec•i•mo

Pronunciation: (ok"tu-des'u-mō"), [key]
— n., pl. adj. -mos
—n.
  1. a book size of about 4 × 6 in. (10 × 16 cm), determined by printing on sheets folded to form 18 leaves or 36 pages. Symbol: 18mo, 18°
  2. a book of this size.
—adj.
  1. in octodecimo. Also called
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.