mack ‧ in ‧ tosh /ˈmækɪntɒʃ $ -tɑːʃ/ BrE AmE noun [countable] British English old-fashioned
[ Date: 1800-1900 ; Origin: Charles Macintosh (1766-1843), Scottish scientist who invented a way of preventing liquid from getting through cloth ]
a coat which you wear to keep out the rain SYN mac , raincoat