Definition of -mo in English:

-mo

suffix

Forming nouns denoting a book size by the number of leaves into which a sheet of paper has been folded: twelvemo

Origin

from the final syllable of Latin ordinal numbers such as duodecimo (masculine ablative singular).

Definition of -mo in:

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Word of the day ween
Pronunciation: wiːn
verb
be of the opinion; think or suppose