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.
(Sainsbury's) Extra Lean Steak Mince-British beef. (Sainsbury's) Steak Mince-Extra lean steak mince, British beef, raw. (Coles) Australian Extra Lean Beef Mince-Contains 5% fat. (Woolworths) Ostrich Mince-Extra Lean.