1. Phenomenon of the change in velocity of propagation of radiation as a function of its frequency, which causes a separation of the monochromatic components of a polychromatic radiation.
2. Property of an optical device, or medium, giving rise to this phenomenon.
3. Quantity characterising this property.
Reference: C.I.E. (modified)
Please note that this is the term as it stands in the original IALA Dictionary edition (1970-1989)
Celsius (previously Centigrade)
International Association of Marine Aids to Navigation and Lighthouse Authorities - AISM