I have a 'brother' mfc-7420 laser fax/printer/copier.I wanna make it wireless.1)is it possible? 2) if yes,how?

I have 3computers running and a wireless laptop -ALL linked to a server. I also have a wireless router. I know I can buy a wireless printer but I would like to know if it is possible to buy a gadget to make my printer wireless.thankyou in advance:-)
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