- Classically, one of a group of enzymes, now termed oxidoreductases (EC class 1), that bring about oxidation by the addition of oxygen to a metabolite or by the removal of hydrogen or of one or more electrons. O. is now used for those cases in which O2 acts as an acceptor (of H or of electrons); those removing hydrogen are now termed dehydrogenases. For individual oxidases, see the specific names.- direct o. originally, an o. catalyzing the transfer of O2 directly to other bodies; now termed oxygenase.- indirect o. originally, an o. that acts by reducing a peroxide; now termed peroxidase.- terminal o. the last protein in the electron transport, respiratory chain. In mammals this is cytochrome c o..
* * *ox·i·dase 'äk-sə-.dās, -.dāz n any of various enzymes that catalyze oxidations esp one able to react directly with molecular oxygen
* * *n.
* * *ox·i·dase (okґsĭ-dās) a term used in the recommended names of some oxidoreductases to denote those in which molecular oxygen is the hydrogen acceptor.
Medical dictionary. 2011.