The fundamental unit comprising a textile raw  material such as cotton, wool, ect.. Fibers may be elongated

single celled seed hairs like cotton; elongated multicellular structures such as wool; an aggregation of elongated

cells like flax; or man made filaments like nylon, polyester, and rayon.

Fiber originanlly meant spinnable material including the natural fibers and short sections of man made

filaments.  Such fibers have a length which is many times as great as their diameter.  In order to be spun into a

yarn, a fiber must possess sufficient length, strength, pliability, and cohesiveness.