Pure, vatted, single malt - some definitions

Q: What is the difference between 'single', 'pure' and 'vatted' malt? [ub 168/4.98]

UB is an expert and was asking for a definitive answer. The resulting lively discussion covered the terms and also their use and abuse by the industry. The last word and as good a definition as emerged was as follows fromu CK:

[ck 172/4.98]

These are a good definition of what the terms should and usually do mean. Some bottlers however use 'pure' and 'vatted interchangeably and occasionally use 'pure' instead of 'single'. Caveat emptor. [jhb]