Webster's English Dictionary

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woof

1. woof \'wu.f, 'wu:f\ n [alter. of ME oof, fr. OE o-wef, fr. o-- (fr. on)] 
   + wefan to weave - more at WEAVE 1a: a filling thread or yarn in weaving  
   1b: woven fabric; also : the texture of such a fabric  2: a basic or 
   essential element or material 
2. woof \'wu.f\ n [imit.] 1: a low gruff sound typically produced by a dog  
   2: a low note emitted by sound reproducing equipment