space-bar

space bar

noun
1.
a horizontal bar on a typewriter keyboard that is depressed in order to resume typing one space to the right.
2.
a horizontal bar on a computer keyboard that is depressed in order to move the cursor one space to the right or, often, to perform some function in a program.

Origin:
1885–90

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
space-bar
 
n
a horizontal bar on a typewriter that is depressed in order to leave a space between words, letters, etc

Collins English Dictionary - Complete & Unabridged 10th Edition
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