Its called "Medical School."
Step 1: Go to medical school. Learn a copious amount of vocabulary that is meaningless without hours of instruction and cross linking to what is already known.
Examples: Atrial Fibrillation, Hepatocellular Dysfunction, Hepatic Encephalopathy, Diabetic Nephropathy
Step 2: Feel confident you finally get some of the lingo and are cool enough to use acronyms, shortened versions, and quick-its so that you can communicate confidently with your coworkers
Examples: Afib, MI (myocardial infarction), SOB (shortness of breath), CTAB (clear to auscultation bilaterally), EGD (Endoscopic Gastroduodenoscopy)
Step 3: Become so confident in your practice that you translate your new language back into dumb. You do that so your patients can understand you, your students can understand you, and the people who think they are in Step 2 (but really arent, because all they've done is copy the phrases without understanding them) understand you
Examples: Heart Attack (MI), Broken Liver (Hepatocellular Dysfunction), Turning Yellow (Jaundice), Funny Heart Beat (arrythmia), Camera down your throat (EGD).
The bottom line is that in the process of learning medicine, disease, and therapy you will learn more new words than are encompassed in most intro AND intermediate language courses combined. You literally learn a new language.
There is no place for a "quick fix." Even people in health care may not know the lingo of one specialty, or even one office. Sorry dude, no such resource exists.