posted by [identity profile] coth.livejournal.com at 04:55pm on 10/06/2014
I think it's in alphabet books as one of the few nouns in English to begin with Y, and because they can draw it very simply as a small boat with sails.

Of course modern yachts are not sailboats, but I bet if you researched it you'd find use of 'yacht' goes back a good few decades - for example: http://www.alephbet.com/pages/books/36423/object-alphabet-book

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