| stereo- | <prefix> A combining form meaning solid, hard, firm, as in stereochemistry, stereography. Origin: Gr. Stereos solid. See Stare to gaze. (29 Oct 1998) |
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| stereo-orthopter | A type of stereoscope used in visual training. Origin: stereo-+ G. Orthos, straight, + optikos, optical (05 Mar 2000) |