Bookbinding and the Conservation of Books
A Dictionary of Descriptive Terminology

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dog ear

1. An oversize, unfolded corner in a publication caused when a sheet in a pile of paper having a corner turned under is trimmed in the guillotine. After trimming, the corner of the defective sheet extends beyond the trim size of the sheet when the folded corner is then unfolded. The dog ear is often useful in early books in determining the size of the leaf and the sheet because it reveals the size of the untrimmed leaf. 2. The turned-down corner of a leaf. See: DOG EARED .

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