mackintosh

A mackintosh, often shortened to "mac," is a waterproof coat worn in the rain. The name comes from Charles Macintosh, a Scottish chemist who patented a waterproof fabric in 1823 by putting a layer of rubber between two pieces of cloth. At first, the word meant a coat made with that material. Today, people also use it more generally for a simple long raincoat, especially in British English. If you put one on before walking out into wet weather, the idea is simple: it keeps you dry.

The word "mackintosh" began as the name of a particular kind of waterproof coat linked to Charles Macintosh in the early 19th century. He developed a way to place dissolved rubber between layers of cloth, which made the fabric resist rain much better than ordinary clothing of the time. Early versions worked well but were also known for being stiff and for having a strong smell. Later improvements in rubber made these coats more practical and comfortable to wear.

Over time, the meaning widened. The word no longer had to mean only the original rubberized coat. It could also mean a long raincoat in general, especially one with a plain, classic style. In modern use, the coat may be made from treated cotton, synthetic fabric, or other water-resistant materials rather than the original material.

Today, "mackintosh" still suggests a practical raincoat with a traditional British feel. In many contexts, especially in British English, it brings to mind a neat coat worn over regular clothes on a wet day. So the word can refer either to the original historical type of waterproof coat or, more broadly, to an ordinary raincoat of that style.