1.  fiber(n = noun.substance) fibre - a slender and greatly elongated substance capable of being spun into yarn;
Derived form adjective fibrous₁

2.  fiber(n = noun.food) roughage - coarse, indigestible plant food low in nutrients; its bulk stimulates intestinal peristalsis;

3.  fiber(n = noun.body) fibre - any of several elongated, threadlike cells (especially a muscle fiber or a nerve fiber);

4.  fiber(n = noun.attribute) character, fibre - the inherent complex of attributes that determines a persons moral and ethical actions and reactions; "education has for its object the formation of character"

5.  fiber(n = noun.artifact) fibre, vulcanized fiber - a leatherlike material made by compressing layers of paper or cloth;

1.  One of the delicate, threadlike portions of which the tissues of plants and animals are in part constituted; as, the fiber of flax or of muscle. [1913 Webster]

2.  Any fine, slender thread, or threadlike substance; as, a fiber of spun glass; especially, one of the slender rootlets of a plant. [1913 Webster]

3.  the inherent complex of attributes that determine a person's moral and ethical actions and reactions; sinew; strength; toughness; as, a man of real fiber. [1913 Webster]

4.  A general name for the raw material, such as cotton, flax, hemp, etc., used in textile manufactures. [1913 Webster]

5.  that portion of food composed of carbohydrates which are completely or partly indigestible, such as cellulose or pectin; it may be in an insoluble or a soluble form. It provides bulk to the solid waste and stimulates peristalsis in the intestine. It is found especially in grains, fruits, and vegetables. There is some medical evidence which indicates that diets high in fiber reduce the risk of colon cancer and reduce cholesterol levels in the blood. It is also called dietary fiber, roughage, or bulk. [PJC]

6.  a leatherlike material made by compressing layers of paper or cloth. [WordNet 1.5]

fiber, US var. of FIBRE.

N  connection, vinculum, link, connective, connection, junction, bond of union, copula, hyphen, intermedium, bracket, bridge, stepping-stone, isthmus, bond, tendon, tendril, fiber, cord, cordage, riband, ribbon, rope, guy, cable, line, halser, hawser, painter, moorings, wire, chain, string, fastener, fastening, tie, ligament, ligature, strap, tackle, rigging, standing rigging, running rigging, traces, harness, yoke, band ribband, bandage, brace, roller, fillet, inkle, with, withe, withy, thong, braid, girder, tiebeam, girth, girdle, cestus, garter, halter, noose, lasso, surcingle, knot, running knot, cabestro, cinch, lariat, legadero, oxreim, suspenders, pin, corking pin, nail, brad, tack, skewer, staple, corrugated fastener, clamp, U-clamp, C-clamp, cramp, cramp iron, ratchet, detent, larigo, pawl, terret, treenail, screw, button, buckle, clasp, hasp, hinge, hank, catch, latch, bolt, latchet, tag, tooth, hook, hook and eye, lock, holdfast, padlock, rivet, anchor, grappling iron, trennel, stake, post, cement, glue, gum, paste, size, wafer, solder, lute, putty, birdlime, mortar, stucco, plaster, grout, viscum, shackle, rein, prop.

N  filament, line, fiber, fibril, funicle, vein, hair, capillament, cilium, cilia, pilus, pili, tendril, gossamer, hair stroke, veinlet, venula, venule, wire, string, thread, packthread, cotton, sewing silk, twine, twist, whipcord, tape, ribbon, cord, rope, yarn, hemp, oakum, jute, strip, shred, slip, spill, list, band, fillet, fascia, ribbon, riband, roll, lath, splinter, shiver, shaving, beard, ramification, strand, filamentous, filamentiferous, filaceous, filiform, fibrous, fibrillous, thread-like, wiry, stringy, ropy, capillary, capilliform, funicular, wire-drawn, anguilliform, flagelliform, hairy, taeniate, taeniform, taenioid, venose, venous.