could try the Oxford Unabridged Been through quite a few, but there's nothing that either declares or disproves a link. The biggest dictionary we have here is the Compact Oxford, which comes in two volumes and has text so tiny it comes with it's own magnifying glass :-) Words like 'librate', which come from 'libra', are only traced back as far as 'libra' in the dictionaries. It's that bit I need to get behind.