fi·ber (US) or Brit fi·bre 
/ˈfaɪbɚ/ noun
plural fi·bers /ˈfaɪbɚ/ noun 1 [noncount] : plant material that cannot be digested but that helps you to digest other food
▪ It's important to get enough fiber in your diet. ▪ dietary fiber ▪ What foods do you recommend as good sources of fiber? ▪ foods that are high in fiber 2 a : a thin thread of natural or artificial material that can be used to make cloth, paper, etc. [count] ▪ The fabric is made from a mix of synthetic fibers. ▪ The natural fibers allow the fabric to breathe. [noncount] ▪ The paper is made from both cotton and wood fiber.
b : material (such as cloth) that is made from thin threads : something made of fibers [count] ▪ Nylon is a very strong man-made fiber. [noncount] ▪ The police examined hair and bits of fiber found in the victim's car. 3 [count] : a long, thin piece of material that forms a type of tissue in your body
▪ muscle/nerve fibers 4 [noncount] formal : strength or toughness of character
▪ cultural changes that have weakened the moral fiber of our nation's youth
▪ It's important to get enough fiber in your diet. ▪ dietary fiber ▪ What foods do you recommend as good sources of fiber? ▪ foods that are high in fiber
b : material (such as cloth) that is made from thin threads : something made of fibers [count] ▪ Nylon is a very strong man-made fiber. [noncount] ▪ The police examined hair and bits of fiber found in the victim's car.
▪ muscle/nerve fibers
▪ cultural changes that have weakened the moral fiber of our nation's youth
with every fiber of your being
: with all of your effort or desire
▪ She wanted to be a doctor with every fiber of her being. ▪ He fought with every fiber of his being for freedom.
▪ She wanted to be a doctor with every fiber of her being. ▪ He fought with every fiber of his being for freedom.
