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Long ago, when people believed that everything was made up of four elements—earth, air, fire, and water—they thought the stars and planets were made up of yet another element. In the Middle Ages, people called this element by its Medieval Latin name, quinta essentia, literally, "fifth essence." They believed the quinta essentia was essential to all kinds of matter, and if they could somehow isolate it, it would cure all disease. People have since given up on that idea, but English users have kept quintessence, the offspring of quinta essentia, as a word for the purest essence of a thing. Some modern physicists have given quintessence a new twist—they use it to refer to a form of the dark energy believed to make up almost 70 percent of the energy in the observable universe.

Franz Kafka (1883-1924) was a Czech-born German-language writer whose surreal fiction vividly expressed the anxiety, alienation, and powerlessness of the individual in the 20th century. The opening sentence of his 1915 story The Metamorphosis has become one of the most famous in Western literature (“As Gregor Samsa awoke one morning from uneasy dreams he found himself transformed in his bed into a gigantic insect”), while in his novel The Trial, published a year after his death, a young man finds himself caught up in the mindless bureaucracy of the law after being charged with a crime that is never named. So deft was Kafka’s prose at detailing nightmarish settings in which characters are crushed by nonsensical, blind authority, that writers began using his name as an adjective a mere 16 years after his death. Although many other literary eponyms, from Austenian to Homeric, exist and are common enough, Kafkaesque gets employed more than most and in a wide variety of contexts, leading to occasional charges that the word has been watered down and given a lack of specificity due to overuse.

If you guessed that quixotic has something to do with Don Quixote, you're absolutely right. The hero of Miguel de Cervantes' 17th-century Spanish novel El ingenioso hidalgo don Quijote de la Mancha (in English "The Ingenious Hidalgo Don Quixote of La Mancha") didn't change the world by tilting at windmills, but he did leave a linguistic legacy in English. The adjective quixotic is based on his name and has been used to describe unrealistic idealists since at least the early 18th century. The novel has given English other words as well. Dulcinea, the name of Quixote's beloved, has come to mean "mistress" or "sweetheart," and rosinante, which is sometimes used to refer to an old horse, comes from the name of the hero's less-than-gallant steed, Rocinante.