a lightweight waterproof (usually rubberized) fabric
"After years of being used as a tent, my grandfather finally replaced his old macintosh raincoat with a modern synthetic shell."
a waterproof raincoat made of rubberized fabric
"She pulled her old macintosh over her head to stay dry during the sudden downpour."
A raincoat.
"I need to download a new driver for my old Macintosh before I can connect it to the printer."
A brand of personal computer manufactured by Apple Inc.
In plain English: A Macintosh is a brand of personal computer made by Apple that people often just call a Mac.
"I use my new macintosh to check my emails during lunch breaks."
Usage: Use macintosh to refer specifically to an Apple computer, though in casual conversation people often shorten it to Mac or Macintosh without capitalizing the 'm'. Avoid using it for any fruit or generic personal computer unless you are quoting a specific brand name.
A Scottish surname, from Scottish Gaelic.
"The new headmaster, Mr. Macintosh, is a direct descendant of the clan that settled in the Highlands centuries ago."
The word macintosh comes from the Scottish Gaelic phrase Mac an Tòisiche, which means "son of the thane." This term was adopted to name a popular apple variety before becoming the brand for waterproof raincoats.