Webster's English Dictionary

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fiber

fi.ber or fi.bre \'fi--b*r\ \-b*rd\ n [F fibre, fr. L fibra] 1: a thread or 
   a structure or object resembling a thread : as  1a1: a slender root (as of 
   a grass)  1a2: an elongated tapering thick-walled plant cell void at 
   maturity that im parts elasticity, flexibility, and tensile strength 1b1: 
   the axis cylinder of a nerve cell with its sheath  1b2: one of the 
   filaments composing most of the intercellular matrix of con nective tissue 
   1b3: one of the elongated contractile cells of muscle tissue  1c: a slender 
   and greatly elongated natural or synthetic filament (as of wo ol, cotton, 
   asbestos, gold, glass, or rayon) typically capable of being spun into yarn 
   2: material made of fibers; specif : VULCANIZED FIBER  3a: an element that 
   gives texture or substance  3b: basic toughness : STRENGTH  3c: essential 
   structure  - fi.bered aj