Noun
dioxygenase (plural dioxygenases)
(biochemistry) Any of several enzymes that catalyze dioxygenation reactions
Hydrolysis of retinyl esters results in retinol, while provitamin A carotenoids can be cleaved to produce retinal by carotene dioxygenase in the intestinal mucosa. Source: Internet
In order to split the aromatic ring of homogentisate, a further dioxygenase, homogentistate-oxygenase is required. Source: Internet
The latter reaction is a remnant activity of the more ancient nitric oxide dioxygenase function of globins. Source: Internet