Webster's English Dictionary

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fibrous

fi.brous \'fi--br*s\ aj [F fibreux, fr. fibre fiber, fr. L fibra] 1a: 
   containing, consisting of, or resembling fibers  1b: characterized by 
   fibrosis  1c: capable of being separated into fibers {a ~ mineral}  2: 
   TOUGH, SINEWY  - fi.brous.ly av