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n.1.A book consisting of sheets, each of which is folded into sixteen leaves; hence, indicating, more or less definitely, a size of book; - usually written 16mo or 16°.
a.1.Having sixteen leaves to a sheet; as, a decimosexto form, book, leaf, size.
Webster's Revised Unabridged Dictionary, published 1913 by G. & C. Merriam Co.
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