eighteenmo.
octodecimo (as a paper size in printing).
Meaning & usage
octodecimo (as a paper size in printing).
Where this word comes from
Etymology tree Proto-Indo-European *oḱtṓw Proto-Germanic *ahtōu Proto-Indo-European *déḱm̥ Proto-Germanic *tehun Proto-Germanic *ahtōutehun Anglian Old English eahtatēne Middle English eightetene English eighteen English -mo English eighteenmo From eighteen + -mo.
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Definitions, grammatical labels, IPA, etymology and examples: Wiktionary contributors, extracted by Kaikki / Wiktextract. Adapted under CC BY-SA 4.0. Selected fields and authored examples are shown; third-party quotations and audio are omitted. See contributor history.
Last enriched 2026-09-10. Definitions are in English. Romanizations are shown when supplied by the source; syllable estimates are omitted for unsupported scripts.