1. A book consisting of sheets each of which is folded into twelve leaves; hence, indicating, more or less definitely, a size of a book
   - duodecimo

Derived forms: twelvemos

• ethnic group
• ethnic joke
• ethnic minority
• ethnic music
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• ethnical
• ethnically
• ethnicity
• ethno-
• ethnobotanist
• ethnobotany
• ethnocentric
• ethnocentrism
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• ethnological
• ethnologically
• ethnologist
• ethnology
• ethnomusicology