Definitions for "space bar"
A bar or key, in a typewriter, typesetting machine, or other keyboard (as a computer keyboard), used to insert a space between letters.
Key on a keyboard that spaces the cursor forward one space at a time and produces a blank space when pressed. (Kybdy, Gr. 1)
Generally an aluminum bar along all edges of a double-glazed unit, filled with desiccant, which separates the twoo panes of glass and creates a cavity.