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.
Pork is a lean meat, which makes it a healthy protein for low-fat meals. Lean cuts of pork, such as center-cut pork chops have a mild, almost bland flavor, and can dry out quickly. Center-cut pork chops, also known as top loin chops or America's cut, are thick, lean, boneless chops cut from the loin portion of the hog.