Dictionary
oc•to•dec•i•mo
Pronunciation: (ok"tu-des'u-mō"), [key]
—n., pl. -mos for 2,
—adj.
—
n.
1. a book size of about 4 × 6 ¼ 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.
in octodecimo. Also called
eighteenmo. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.