1) Hydrogen technology 
Oxyhydrogen is a mixture of hydrogen (H2) and oxygen (O2) gases. This gaseous mixture is used for torches to process refractory materials and was the first gaseous mixture used for welding. Theoretically, a ratio of 2:1 hydrogen:oxygen is enough to achieve maximum efficiency; in practice a ratio 4:1 or 5:1 is needed to avoid an oxidizing flame. Th...
• (a.) Of, pertaining to, or consisting of, a mixture of oxygen and hydrogen at over 5000
<chemistry> Of or pertaining to a mixture of oxygen and hydrogen; as, oxyhydrogen gas. Oxyhydrogen blowpipe. ... <chemistry> See Blowpipe. Oxyhydrogen microscope, a form of microscope arranged so as to use the light produced by burning lime or limestone under a current of oxyhydrogen gas. ... Origin: Oxy- + hydrogen. ... Source: Webster...
Ox`y·hy'dro·gen adjective [ Oxy- (a) + hydrogen .] (Chemistry) Of or pertaining to a mixture of oxygen and hydrogen; as, oxyhydrogen gas. Oxyhydrogen blowpipe . (Chemistry) 
oxyhydrogen Consisting of a mixture of oxygen and hydrogen.
pertaining to or involving a mixture of oxygen and hydrogen.