oleo

Etymology 1

Clipping of oleo strut.

noun

1. (aviation) 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.

Etymology 2

From oleum (“olive oil”).

noun

1. (US) The various fats and oils that go into the making of margarine.

Etymology 3

Clipping of oleomargarine.

noun

1. (US, dated) Margarine.