a wedge-shaped piece of metal used in typecasting machines to adjust the space between words and to justify lines of type.
Origin of spaceband
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
printing a device on a linecaster for evening up the spaces between words
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