醬油

The English word 'soy' — as in soy sauce and the soybean — derives from Japanese shōyu (醤油), the Japanese word for soy sauce. But shōyu itself is the Japanese pronunciation of Chinese characters: 醤 (jiàng in Mandarin, a type of fermented paste) and 油 (yóu, oil or liquid). The Hokkien dialect pronunciation of these characters — siyu or sieu-yu — was the form that Dutch traders first encountered at their trading post on Dejima island in Nagasaki in the seventeenth century, where they had Japan's only open trade window to the outside world. The Dutch exported Japanese soy sauce to Europe, recorded the Hokkien-influenced pronunciation they heard from Japanese merchants, and the word passed from Dutch soya into English by the late seventeenth century.

The fermented condiment itself is far older than the word's path to English. Fermented soybean pastes and sauces have been produced in China since at least the Zhou Dynasty (1046–256 BCE); soy sauce as a liquid condiment emerged during the Han Dynasty (206 BCE – 220 CE). Chinese Buddhist monks brought soy fermentation techniques to Japan around the 7th century CE, and Japanese craftspeople developed their own fermentation traditions — tamari, miso, and eventually shōyu — over the following centuries. By the Edo period (1603–1868), Japanese soy sauce production in cities like Noda and Chōshi had become a major industry.

The soybean itself — Glycine max — is native to East Asia and was one of the five sacred grains of ancient China, cultivated for millennia as food, oil, and animal feed. When Dutch traders brought soy sauce samples to Europe in the seventeenth century, the word 'soy' began to be applied not only to the sauce but eventually, in the nineteenth and twentieth centuries, to the bean itself. English 'soybean' (or 'soya bean' in British English) is therefore a compound using a Chinese-Japanese-Dutch word for sauce applied to the plant from which the sauce is made — a retronym of sorts.

Today soy is one of the world's most consequential agricultural commodities. The United States, Brazil, and Argentina are the largest producers; the soybean is used in animal feed, vegetable oil, tofu, soy milk, soy sauce, biodiesel, and dozens of industrial applications. The word 'soy' — compact, versatile, cross-linguistic — names all of it, from the bean in the field to the sauce on the table. The Chinese fermentation tradition that gave the world this condiment is now a global agro-industrial system, and a word that began in Chinese characters has become the prefix of an entire food category.