cadillac (n.) A large pear, shaped like a flattened top, used chiefly
for cooking.
Wikipedia
Cadillac is an automobile maker, owned by General Motors. They are known for making luxury cars. In the United States during the 20th century, Cadillacs were so highly thought of that the phrase "the Cadillac of x" was coined, meaning that something is of excellent quality and better than everything else in its category.
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