Webster's English Dictionary

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waterproof

1. wa.ter.proof \.wo.t-*r-'pru:f, .wa:t-\ aj : impervious to water; esp : 
   covered or treated with a material ( as a solution of rubber) to prevent 
   permeation by water - wa.ter.proof.ness n
2. waterproof \'wo.t-*r-., 'wa:t-\ n 1: a waterproof fabric  chiefly Brit  
   2: RAINCOAT 
3. waterproof \.wo.t-*r-', .wa:t-\ vt : to make waterproof