RxDefine, a healthcare engagement platform for consumers and HCPs, announced that the company has launched a new visual identity and officially changed its name to Ostro. Ostro's name change comes on the heels of closing an additional $45 million in funding from Founders Fund, Byers Capital, Caffeinated Capital, Greycroft, Bling Capital, Trust Ventures, and RRE Ventures, bringing Ostro's total funding to over $55M.