A band or strap which encircles the body; especially, one by which a saddle is fastened upon the back of a horse. [1913 Webster]

The measure around any object, such as a body at the waist or belly, or a box ; the circumference of anything; as, in order to be acceptable for mailing, the total of height and girth of a package must not exceed 63 inches. [1913 Webster]
"He's a lusty, jolly fellow, that lives well, at least three yards in the girth." [1913 Webster]

A small horizontal brace or girder. [1913 Webster]

girth, v. t. [From Girth, n., cf. Girt, v. t.].

To bind as with a girth. Johnson. [1913 Webster]

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OXFORD DICTIONARY

girth, n. & v. (also girt)
--n.
1 the distance around a thing.
2 a band round the body of a horse to secure the saddle etc.
--v.
1 tr. a secure (a saddle etc.) with a girth. b put a girth on (a horse).
2 tr. surround, encircle.
3 intr. measure (an amount) in girth.

Etymology

ME f. ON gj{ouml}rth, Goth. gairda f. Gmc

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THESAURUS

girth
ambit, amplitude, anchor, anklet, area, armlet, back band, backstrap, band, bandage, bar, barrette, bearing rein, bellyband, belt, bend, bigness, bind, bind up, binding, binding stone, binding twine, bit, blinders, blinds, bobby pin, body, bollard, bolt, bonder, bondstone, border, box hook, brace, bracelet, braces, brad, braid, breadth, breeching, bridle, buckle, bulk, bundle, button, cable, caliber, caparison, carpet tack, catch, cavesson, cestus, chain, checkrein, cheekpiece, chinband, cinch, cincture, cingulum, circuit, circumference, clamp, clasp, cleat, click, clinch, clip, clothespin, collar, collarband, corking pin, cotter, coverage, crownband, crupper, cummerbund, curb, depth, diameter, dimension, dimensions, do up, dowel, earring, ecliptic, equator, expanse, expansion, extension, extent, fascia, fibula, fillet, finger ring, fishhook, funiculus, gag swivel, garter, gauge, gird, girdle, girt, grab, grapnel, grappler, grappling iron, great circle, greatness, guy, hackamore, hairpin, halter, hames, hametugs, hank, harness, hasp, hawser, haywire, headgear, headstall, height, hip straps, hitch, hitching post, holdfast, hook, hook and eye, hoop, horn, inkle, interlocker, jaquima, jerk line, jockey, kevel, kingpin, lace, lacing, largeness, lariat, lash, latch, latchet, leader, leash, length, ligament, line, lines, lock, loop, magnitude, martingale, mass, measure, measurement, moorings, nail, neckband, necklace, noose, nose ring, noseband, nut, padlock, paper clip, pawl, peg, perimeter, periphery, pin, pintle, pole strap, pommel, proportion, proportions, quoit, radius, range, reach, reins, ribbons, ring, rivet, roller, rope, saddle, safety pin, scale, scope, screw, seal, sennit, setscrew, shaft tug, side check, size, skewer, slide fastener, snaffle, snap, snubbing post, spike, splice, spread, staple, stirrup, strap, string, strop, stub tenon, surcingle, suspenders, swaddle, swathe, tack, tackle, tag, tendon, terret, thole, tholepin, thong, thumbtack, tie, tie beam, tie up, toggle, trappings, treenail, truss, tug, twine, vise, volume, waistband, whang, width, winker braces, wire, wrap, wrap up, wristband, wristlet, yoke, zipper, zodiac, zone

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ROGET THESAURUS

girth

Connection
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.

Outline
N outline, circumference, perimeter, periphery, ambit, circuit, lines tournure, contour, profile, silhouette, bounds, coast line, zone, belt, girth, band, baldric, zodiac, girdle, tyre, cingle, clasp, girt, cordon, circlet.

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