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.
When shopping for meat, words like round, loin or leg indicate cuts that are lean or lower in total fat and saturated fat. If you're not sure of the cut, ask the butcher or check the label. Examples of lean cuts of meat are: Beef: Eye round, top round, round tip, bottom round, sirloin, top loin, tenderloin, flank. These may be cut as roasts or steaks. For ground beef, choose 95% lean ground beef. Pork: Tenderloin, top loin roast, loin chop, sirloin chop, rib roast or chop and boneless ham. To prepare lean cuts of meat, try broiling, grilling, roasting, panbroiling, braising, stewing or stir-frying.