Oxyhydrogen (?), a. [Oxy- (a) + hydrogen.] (Chem.) Of, pertaining to, or consisting of, a mixture of oxygen and hydrogen at over 5000° F.
[Webster 1913 Suppl.]

Oxyhydrogen blowpipe. (Chem.) 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.
[1913 Webster]