(mathematics) A topological space homeomorphic to a plane (or open disk) and equipped with a hyperbolic metric.

(geology) The plane, or surface formed between the two rock blocks that slip one with the other during an earthquake. The edge of the fault plane can often be seen on the land as a fault line.

(anatomy) The only plane along which the human body is roughly symmetrical, running from the top to the bottom through navel, separating the left and the right hand.

(anatomy) Any imaginary plane parallel to median plane.

(mathematics) The plane containing the circle formed by the intersection of two spheres (or whose points have equal power with respect to two non-intersecting spheres)

plural of oblique plane

(aviation) A winged aircraft that is propelled by a rocket engine.

Alternative spelling of bitplane

A plane located halfway between the suprasternal notch and the upper border of the symphysis pubis; this indicates the margin of the transpyloric plane, which in most cases cuts through the pylorus, the tips of the ninth costal cartilages and the lower border of the first lumbar vertebra.

A light, propeller-driven aircraft, with a high wing, designed to land on, and take off from grass airstrips or rough ground