in Anatomy, a perfectly simple body, or at least as simple as any thing in the human structure; being fine and slender like a thread, and serving to form other parts. Hence some fibres are hard, as the bony ones; and others soft, as those destined for the formation of all the other parts.

The fibres are divided also, according to their position and and direction, into such as are straight, oblique, transverse, annular, and spiral; as they are arranged in these directions in different parts of the body.

Fibre is also used to denote the slender filaments which compose other bodies, whether animal, vegetable, or mineral; but more especially the capillary roots of plants.