My wife and I both work in a hospital, and she also teaches. This on-my-phone Dorlands has saved me more times than I can recall. Its very stable (iPhone 5s, with iOS 10.x.x), and it works reliably every time. There are 3 or 4 main medical dictionaries in book form, and I came to prefer the Dorlands during my graduate work. I like the way terms and concepts are described. For medical terms, I use this and the Shorter Oxford English dictionary, often both at the same time, to clarify terms. Very useful, and worth the money.
alwaysmprest about Dorland’s Medical Dictionary, v8.2.9