The Collaborative International Dictionary of English v.0.48:

Buff \Buff\, a. [Of uncertain etymol.]
   Firm; sturdy.
   [1913 Webster]

         And for the good old cause stood buff,
         'Gainst many a bitter kick and cuff.     --Hudibras.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Buff \Buff\, a.
   1. Made of buff leather. --Goldsmith.
      [1913 Webster]

   2. Of the color of buff.
      [1913 Webster]

   Buff coat, a close, military outer garment, with short
      sleeves, and laced tightly over the chest, made of buffalo
      skin, or other thick and elastic material, worn by
      soldiers in the 17th century as a defensive covering.

   Buff jerkin, originally, a leather waistcoat; afterward,
      one of cloth of a buff color. [Obs.] --Nares.

   Buff stick (Mech.), a strip of wood covered with buff
      leather, used in polishing.
      [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Buff \Buff\ (b[u^]f), n. [OE. buff, buffe, buff, buffalo, F.
   buffle buffalo. See Buffalo.]
   1. A sort of leather, prepared from the skin of the buffalo,
      dressed with oil, like chamois; also, the skins of oxen,
      elks, and other animals, dressed in like manner. "A suit
      of buff." --Shak.
      [1913 Webster]

   2. The color of buff; a light yellow, shading toward pink,
      gray, or brown.
      [1913 Webster]

            A visage rough,
            Deformed, unfeatured, and a skin of buff. --Dryden.
      [1913 Webster]

   3. A military coat, made of buff leather. --Shak.
      [1913 Webster]

   4. (Med.) The grayish viscid substance constituting the buffy
      coat. See Buffy coat, under Buffy, a.
      [1913 Webster]

   5. (Mech.) A wheel covered with buff leather, and used in
      polishing cutlery, spoons, etc.
      [1913 Webster]

   6. The bare skin; as, to strip to the buff. [Colloq.]
      [1913 Webster]

            To be in buff is equivalent to being naked.
                                                  --Wright.
      [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Buff \Buff\, v. t.
   to polish with a soft cloth, especially one similar to a
   buff[5]. See Buff, n., 5.
   [1913 Webster +PJC]

The Collaborative International Dictionary of English v.0.48:

Buff \Buff\, v. t. [OF. bufer to cuff, buffet. See Buffet a
   blow.]
   To strike. [Obs.] --B. Jonson.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Buff \Buff\, n. [See Buffet.]
   A buffet; a blow; -- obsolete except in the phrase
   "Blindman's buff." See blindman's buff.
   [1913 Webster]

         Nathless so sore a buff to him it lent
         That made him reel.                      --Spenser.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

colorful \colorful\ adj.
   1. having striking color. Opposite of colorless.

   Note: [Narrower terms: changeable, chatoyant, iridescent,
         shot; deep, rich; flaming; fluorescent, glowing;
         prismatic; psychedelic; red, ruddy, flushed,
         empurpled]

   Syn: colourful.
        [WordNet 1.5]

   2. striking in variety and interest. Opposite of colorless
      or dull. [Narrower terms: brave, fine, gay, glorious;
      flamboyant, resplendent, unrestrained; flashy, gaudy,
      jazzy, showy, snazzy, sporty; picturesque]
      [WordNet 1.5]

   3. having color or a certain color; not black, white or grey;
      as, colored crepe paper. Opposite of colorless and
      monochrome.

   Note: [Narrower terms: tinted; touched, tinged; amber,
         brownish-yellow, yellow-brown; amethyst; auburn,
         reddish-brown; aureate, gilded, gilt, gold, golden;
         azure, cerulean, sky-blue, bright blue; bicolor,
         bicolour, bicolored, bicoloured, bichrome; blue,
         bluish, light-blue, dark-blue; blushful,
         blush-colored, rosy; bottle-green; bronze, bronzy;
         brown, brownish, dark-brown; buff; canary,
         canary-yellow; caramel, caramel brown; carnation;
         chartreuse; chestnut; dun; earth-colored,
         earthlike; fuscous; green, greenish, light-green,
         dark-green; jade, jade-green; khaki; lavender,
         lilac; mauve; moss green, mosstone; motley,
         multicolor, culticolour, multicolored, multicoloured,
         painted, particolored, particoloured, piebald, pied,
         varicolored, varicoloured; mousy, mouse-colored;
         ocher, ochre; olive-brown; olive-drab; olive;
         orange, orangish; peacock-blue; pink, pinkish;
         purple, violet, purplish; red, blood-red, carmine,
         cerise, cherry, cherry-red, crimson, ruby, ruby-red,
         scarlet; red, reddish; rose, roseate; rose-red;
         rust, rusty, rust-colored; snuff, snuff-brown,
         snuff-color, snuff-colour, snuff-colored,
         snuff-coloured, mummy-brown, chukker-brown; sorrel,
         brownish-orange; stone, stone-gray; straw-color,
         straw-colored, straw-coloured; tan; tangerine;
         tawny; ultramarine; umber; vermilion,
         vermillion, cinibar, Chinese-red; yellow, yellowish;
         yellow-green; avocado; bay; beige; blae
         bluish-black or gray-blue); coral; creamy; cress
         green, cresson, watercress; hazel; honey,
         honey-colored; hued(postnominal); magenta;
         maroon; pea-green; russet; sage, sage-green;
         sea-green] [Also See: chromatic, colored, dark,
         light.]

   Syn: colored, coloured, in color(predicate).
        [WordNet 1.5]

WordNet (r) 3.0 (2006):

buff
    adj 1: of the yellowish-beige color of buff leather
    n 1: an ardent follower and admirer [syn: fan, buff,
         devotee, lover]
    2: a soft thick undyed leather from the skins of e.g. buffalo or
       oxen
    3: bare skin; naked; "swimming in the buff"
    4: a medium to dark tan color [syn: yellowish brown, raw
       sienna, buff, caramel, caramel brown]
    5: an implement consisting of soft material mounted on a block;
       used for polishing (as in manicuring) [syn: buff, buffer]
    v 1: strike, beat repeatedly; "The wind buffeted him" [syn:
         buffet, buff]
    2: polish and make shiny; "buff the wooden floors"; "buff my
       shoes" [syn: buff, burnish, furbish]

Moby Thesaurus II by Grady Ward, 1.0:

240 Moby Thesaurus words for "buff":
   Leatherette, Leatheroid, Maecenas, abettor, adherent, admirer,
   advocate, aficionado, amateur, angel, apologist, appendage,
   applauder, appreciator, attendant, attender, audience, aureate,
   auric, authority, backer, bareness, beige, birthday suit, booster,
   buff-yellow, bug, burnish, canary, canary-yellow,
   cavaliere servente, champion, citron, citron-yellow, claqueur,
   coat, collector, commender, connoisseur, courtier, crank, cream,
   creamy, critic, cuticle, dangler, decollete, defender, dependence,
   dependent, dermis, devotee, dilettante, disciple, dress, ecdysiast,
   ecru, encomiast, encourager, endorser, energumen, enthusiast,
   eulogist, eulogizer, expert, exponent, extoller, fallow, fan,
   fanatic, fanatico, fancier, favorer, fell, finish, flaxen, fleece,
   flesh, flunky, follower, following, freak, frequenter,
   friend at court, fur, furbish, furring, gilded, gilt, glance,
   glaze, gloss, gold, gold-colored, golden, groupie, gymnosophist,
   gymnosophy, habitue, hanger-on, haunter, henchman, hide,
   homme de cour, hound, idolater, idolizer, imitation fur,
   imitation leather, infatuate, integument, jacket, lauder, leather,
   leather paper, leathern, leathery, lemon, lemon-yellow, lover,
   lunatic fringe, luster, luteolous, lutescent, mainstay, maintainer,
   monomaniac, nakedness, naturism, naturist, not a stitch, nudism,
   nudist, nudity, nut, ocherish, ocherous, ochery, ochreous, ochroid,
   ochrous, ochry, or, outer layer, outer skin, panegyrist, paranymph,
   parasite, partisan, patron, pelt, peltry, plugger, polish, praiser,
   primrose, primrose-colored, primrose-yellow, promoter, protagonist,
   public, puffer, pundit, pursuer, pursuivant, rawhide, reliance,
   rind, rooter, rub, rub up, saffron, saffron-colored,
   saffron-yellow, sallow, sand, sand-colored, sandblast, sandpaper,
   sandy, satellite, savant, scholar, scour, second, seconder,
   sectary, shadow, sheath, shine, sider, skin, skins, sleek, slick,
   slick down, smooth, specialist, spectator, sponsor, stalwart,
   standby, state of nature, stooge, straw, straw-colored, stripper,
   stripteaser, successor, support, supporter, sustainer, sympathizer,
   tagtail, tail, technical expert, technician, tegument,
   the altogether, the nude, the raw, theatergoer, toplessness, tout,
   touter, trainbearer, upholder, vair, varnish, visitor, votary,
   ward heeler, wax, well-wisher, worshiper, xanthic, xanthous,
   yellow, yellowish, zealot