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.
Look for lean cuts. Certain cuts of meat and poultry are lower in fat. Lean cuts of beef include round, chuck, sirloin and tenderloin. Lean pork or lamb includes tenderloin, loin chops and leg. The leanest poultry is white meat from the breast with no skin.