Princeton's WordNet

1. macintosh, mackintosh, mac, mack(noun)

   a waterproof raincoat made of rubberized fabric

Wiktionary

1. Mac(Noun)

   Used to address a man whose name is unknown.

   Have you got a light, Mac?

2. Mac(Noun)

   A Macintosh computer (made by Apple Computer), or its operating system.

3. Mac(ProperNoun)

   A diminutive of the male given name Max.

Origin: Shortened from mackintosh

Webster Dictionary

1. Mac

   a prefix, in names of Scotch origin, signifying son

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