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.
Sources of lean protein include chicken, eggs, fish, lentils and turkey. If you're partial to red meat, stick with the leanest cuts, choose moderate portion sizes, and make it an occasional part of your diet, the Harvard School of Public Health recommends.