Octodecimo

[ok-tuh-des-uh-moh] /ˌɒk təˈdɛs əˌmoʊ/

noun, plural octodecimos for 2.
1.
a book size of about 4 × 6 1/4 inches (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.
adjective
3.
in octodecimo.
/ˌɒktəʊˈdɛsɪməʊ/
noun (pl) -mos
1.
(bookbinding) another word for eighteenmo

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