Source : Webster's Revised Unabridged Dictionary (1913)

Typo \Ty"po\, n. [An abbreviation of typographer.]
   A compositor. [Colloq.]

Source : WordNet®

typo
     n : a mistake in printed matter resulting from mechanical
         failures of some kind [syn: {misprint}, {erratum}, {typographical
         error}, {literal error}, {literal}]

Source : Free On-Line Dictionary of Computing

typo
     
        {typographical error}