noun A type of energy-absorbing landing gear strut in which sudden compression or extension of the strut causes a gas-filled chamber to push or pull a piston which forces oil through a small orifice, resulting in absorption of energy through viscous effects.
If the oil leaks out of the oleos, they won't be able to cushion the aircraft against a hard landing.
noun The various fats and oils that go into the making of margarine.