Fibre/ˈfaɪbər/ Definition 1 of 4Pro Tip 1/2Natural versus Synthetic Differentiate fibres from natural sources like cotton and synthetic ones like nylon in context. She prefers clothes made of natural fibre. Pro Tip 2/2Texture Connotation Use 'fibre' to describe a texture that you can feel or see, such as the roughness of a textile. The fibre of this towel feels so soft.