Definition: A single elongated piece of a given material, roughly round in cross-section, often twisted with other fibers to form thread.

Alright class, settle down now, let’s take a peek, At the word "fiber," something we all should seek! The dictionary's giving you a clue, About these strands, both strong and true. It says they're “elongated,” long and lean, Like little ropes, a vibrant scene. “Roughly round” – think of a pebble small, A circular shape, standing tall! And most importantly, listen close and see, "Twisted with other fibers," for you and me! They join together, a tangled delight, To form a thread, shining bright! So fiber is basically tiny strands, Held together in intricate hands. Think of wool or cotton, soft and neat, Made up of fibers, oh so sweet! Do you have any questions for me? Let's discuss with glee!