I have long had my own definition:  Morals are absolute value judgements, usually derived from dogma (a religion or philosophy); while Ethics is the guide to conduct predicate on Morals.  As a mathematician I like the division because it is analogous to that between Axioms and Theorems.  Morals (Axioms) must be assumed, whereas Ethics (Theorems) can be derived from Morals.

 

I've been reading Russell's History of Western Philosophy and my definition doesn't seem to match those used by professional philosophers.