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.
Lean protein isn't just about choosing the right cut of meat, however. There are plenty of vegetarian sources that make a prime protein source, like beans, quinoa, tofu, and unsalted nuts. In fact, switching out your meat routine just once a week may help you be healthier by reducing your risk of diseases like cancer.