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mackintosh (n.)

waterproof outer coat or cloak, 1836, named for Charles Macintosh (1766-1843), inventor of a waterproofing process (patent #4804, June 17, 1823). The surname is from Gaelic Mac an toisich "Son of the chieftain."

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Definitions of mackintosh from WordNet

mackintosh (n.)
a lightweight waterproof (usually rubberized) fabric;
Synonyms: macintosh
mackintosh (n.)
a waterproof raincoat made of rubberized fabric;
Synonyms: macintosh / mac / mack
From wordnet.princeton.edu