WordReference Random House Unabridged Dictionary of American English © 2020
Smyth sew′ing  (smīth, smith),USA pronunciation [Bookbinding.]
  1. Printinga method of sewing together folded, gathered, and collated signatures with a single thread sewn through the folds of individual signatures.
Also,  Smythe sew′ing.  Smyth-sewn′, adj. 
  • after David M. Smyth (1833–1907), Irish-born U.south, southern. inventor, who designed a machine performing this kind of sewing

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