The word 'wino' is a modern English slang formation. Its core, 'wine', traces back to Latin 'vīnum', which entered Proto-Germanic and subsequently Old English. The appended '-o' suffix emerged in 19th and 20th century English slang to create informal nouns for types of people, as seen in terms like 'weirdo' or 'kiddo'. Thus, 'wino' literally constructs a "wine-person," specifically denoting someone whose identity is defined by an excessive dependence on cheap wine, reflecting its association with poverty and addiction in contemporary usage.

Structure: wine (alcoholic beverage) + o (person associated with) - wine: From Old English 'wīn', from Proto-Germanic 'wīną', a loanword from Latin 'vīnum' (wine). Functions as the core semantic root. - o: A slang suffix of uncertain origin, possibly from the interjection 'oh' or a clipping of words like 'fellow'. Functions as a colloquial agent-noun suffix denoting a person characterized by the root.