The word 'hybrid' began in a Roman pigsty. Latin hybrida (sometimes spelled ibrida) referred to the offspring of a domesticated sow and a wild boar — a specific and fairly common agricultural cross-breed. Pliny the Elder used the word in his Natural History, and Roman farmers would have recognised it instantly. The deeper etymology is contested. One prominent theory links hybrida to Greek hybris ('outrage, wanton violence'), suggesting that Romans viewed cross-breeding as a transgression against natural categories. Other scholars dismiss this connection, arguing that the Latin word is native Italic and unrelated to Greek. Whatever its ultimate origin, the word remained agricultural and biological for centuries. English adopted it in 1601, initially for cross-bred plants and animals. Botanists and zoologists kept it as specialist vocabulary until the nineteenth century, when the metaphorical potential became irresistible. Hybrid cultures, hybrid languages, hybrid technologies — the word proved endlessly adaptable. The twentieth century brought hybrid cars, hybrid warfare, and hybrid working. From one pig cross to a universal concept of mixing, hybrida has proved to be a remarkably productive piece of farmyard Latin.