A device used to alter the spatial distribution of a luminous flux and depending essentially on the phenomenon of diffusion.
Note: If all the radiation reflected or transmitted by the diffuser is diffused, it is said to be Completely Diffusing.
Reference: C.I.E. (extract)
Please note that this is the term as it stands in the original IALA Dictionary edition (1970-1989)
nertia of the water plane
Celsius (previously Centigrade)
International Association of Marine Aids to Navigation and Lighthouse Authorities - AISM