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 meat is lower in saturated fats that other meats, which is beneficial for heart health. Meats are a rich source of iron, magnesium, zinc and B vitamins. These nutrients help form new red blood cells, build strong bones and support immune health. 3.5 ounce (100 grams) serving of meat needs to have less than 10 gm of total fat, 4.5 gm of saturated fat and 95 milligrams of cholesterol in order to be considered lean, according to the United States Department of Agriculture (USDA).