What is the difference between a ribeye steak and a prime rib?

To start with "prime rib" is an Amerifictation or colloquialism. "Prime Ribs"-main ribs- is also a misconception, as ribs 1 to 6 protect the heart and are the animals prime ribs. Originally the"prime rib cut (it does not have to be roasted) consisted of only two ribs (11 and 12) and had to be cut from a prime grade carcass; anything else including ribs 6 to 12 was just standing rib considered as were all front quarter cuts second rate. Al (Alex-Alexander) D Girvan. New York strip or strip steak is better thought of as stripped loin or steak. It is the short (by far the best and most expensive of all roast able cuts) loin from which the bones and most importantly the coveted fillet or tenderloin have been stripped off, taken away, and reserved for sale at higher profit. Originally the entire fillet or tender part of the short loin was also known as fillet mignon (French). Porterhouse steaks (bone in cut)contain the very largest part of the tender- loin;the same part of the tenderloin tat is usually used for theChateaubriand steak recipe and presentation.