British Blue Blood is a term used to describe the upper class of British society. It is derived from the fact that members of the aristocracy have historically been referred to as 'blue bloods' due to their noble heritage. The two crossword solutions for this term are EARL (4 letters) and Aristo (6 letters). An EARL is a title of nobility in Britain, ranking below a marquess and above a viscount. An Aristo is a person of aristocratic background or high social standing.