A gyre is another name for a swirling vortex. Ocean gyres are large swirling bodies of water that are often on the scale of a whole ocean basin or 1000 s of kilometers across (hundreds to thousands of miles across).
Lean meats are meats with a relatively low fat content. Skinless chicken and turkey and red meat, such as pork chops, with the fat trimmed off are examples of lean meat.
Meat is cut from the muscles of mammals and birds. For some reason, fish muscle is not considered meat by some people, but it should be. Lean muscle tissue typically breaks down like this: Water (about 75%), protein (20%), fats (5%), carbohydrates (1%), and vitamins, sugars, and minerals (1%).