• Hydr- – A combining form of hydrogen, indicating hydrogen as an ingredient, as hydrochloric; or a reduction product obtained by hydrogen, as hydroquinone.
gydr-, bydr-, nydr-, jydr-, uydr-, yydr-, htdr-, hgdr-, hhdr-, hudr-, h7dr-, h6dr-, hysr-, hyxr-, hycr-, hyfr-, hyrr-, hyer-, hyde-, hydd-, hydf-, hydt-, hyd5-, hyd4-, hydr0, hydrp, ydr-, hdr-, hyr-, hyd-, hydr, yhdr-, hdyr-, hyrd-, hyd-r, hhydr-, hyydr-, hyddr-, hydrr-, hydr--