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hollow back

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noun Bookbinding.
  1. a paper tube or roll, almost flattened, having one side glued to the back of a book and the other to the inside of the spine.
Related formshol·low-backed, adjective
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
hollow back in Medicine

hollow back

(hŏlō)
n.
  1. lordosis