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From The Collaborative International Dictionary of English v.0.48:
Oxyhydrogen \Ox`y*hy"dro*gen\, a. [Oxy (a) + hydrogen.] (Chem.) Of, pertaining to, or consisting of, a mixture of oxygen and hydrogen at over 5000[deg] 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]