'Zeeman effect' definitions:

Definition of 'Zeeman effect'

From: GCIDE

Zeeman effect \Zee"man ef*fect"\ (Physics) The widening and duplication, triplication, etc., of spectral lines when the radiations emanate in a strong magnetic field, first observed in 1896 by P. Zeeman, a Dutch physicist, and regarded as an important confirmation of the electromagnetic theory of light. [Webster 1913 Suppl.]