(optics) A type of lens aberration which causes blurriness, particularly away from the centre of the lens.

plural of aberrant conduction

(medicine) A heart condition where the electrical stimulus travels via an abnormal pathway.

(optics) Alternative form of spherical aberration

A deviation in mental function.

(optics) Deviation from the correct point of focus measured perpendicular to the axis.

(optics) Deviation from the correct point of focus measured parallel to the axis.

(astronomy) A deviation due to the Earth's orbital motion.

(astronomy) A deviation of where a planet appears to be, due to the motion of the planet during the time that the light reaches the Earth.

(astronomy) A deviation due to the earth's axial rotation.