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hair space

noun Printing.
  1. the thinnest metal space used to separate words, symbols, etc.
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Origin of hair space

First recorded in 1835–45
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
British Dictionary definitions for hair space

hair space

noun
  1. printing the thinnest of the metal spaces used in setting type to separate letters or words
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Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012