Ste·re·o-  A combining form meaning solid, hard, firm, as in stereo-chemistry, stereography.
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  stereo
       adj : designating sound transmission from two sources through two
             channels [syn: stereophonic, two-channel]
       n 1: reproducer in which two microphones feed two or more
            loudspeakers to give a three-dimensional effect to the
            sound [syn: stereo system, stereophonic system]
       2: two photographs taken from slightly different angles that
          appear three-dimensional when viewed together [syn: stereoscopic
          picture, stereoscopic photograph]