French flaps: Extensions of the cover of a paperback that fold elegantly back inside the book and hold extra copy, in imitation of the flaps of the jacket of a hardcover book. Très chic.
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Headbands: Adorable, colorful ribbons at the top and bottom of hardcover books. They are there to delight you.
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Monograph: A scholarly tome on a single subject or limited aspect of a subject. Monographs were once bought primarily by libraries that used to have “standing orders” for all books on certain topics from specific presses. Those days are gone. Those days have been gone for a long time. Remember that when you are revising your dissertation.
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Orphan: This refers to the first line of a paragraph left sitting by itself at the bottom of a page. “Widows” are the final line of a paragraph left alone at the top of a page. It’s the publisher who creates that kind of loneliness; it’s the publisher who should take care of it.
Some of it is specific to academic publishing, and much of it is, sadly, pretty straightforward, but you may find it of use when trying to explain certain phenomena to the uninitiated.