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 any cut of meat with less than 10 grams of fat per 3-ounce serving, according to the U.S. Department of Agriculture. One 2- to 3-ounce serving of skinless poultry contains under 3 grams of fat. Poultry cuts are among the leanest meats you will find at most grocery stores.