Plural form of duodecimo; multiple books or items of duodecimo size.
From duodecimo + '-s' (plural marker). The plural maintains the Spanish/Latin grammatical structure where duodecimo refers to the book size format.
Antiquarian book collectors get genuinely excited about identifying duodecimos in old libraries—the size and binding style tell the story of when and where a book was published, almost like DNA for documents!
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