[1] : The Collaborative International Dictionary of English v.0.48

ass \ass\, n. oe. asse, as. assa; akin to icel. asni, w. asen,
   asyn, l. asinus, dim. aselus, gr. ?; also to as. esol, ohg.
   esil, g. esel, goth. asilus, dan. aesel, lith. asilas,
   bohem. osel, pol. osiel. the word is prob. of semitic origin;
   cf. heb. ath?n she ass. cf. ease.
   1. zool. a quadruped of the genus equus equus asinus,
      smaller than the horse, and having a peculiarly harsh bray
      and long ears. the tame or domestic ass is patient, slow,
      and sure-footed, and has become the type of obstinacy and
      stupidity. there are several species of wild asses which
      are swift-footed.
      1913 webster

   2. a dull, heavy, stupid fellow; a dolt. --shak.
      1913 webster

   asses' bridge. l. pons asinorum. the fifth proposition of
      the first book of euclid, "the angles at the base of an
      isosceles triangle are equal to one another." sportive
      "a schoolboy, stammering out his asses' bridge." --f.
      harrison.

   to make an ass of one's self, to do or say something very
      foolish or absurd.
      1913 webster
see also:
ease equus equus asinus asses' bridge to make an ass of one's self 

[2] : The Collaborative International Dictionary of English v.0.48

butt \butt\, but \but\, n. f. but butt, aim cf. butte knoll,
   or bout, of. bot, end, extremity, fr. boter, buter, to push,
   butt, strike, f. bouter; of german origin; cf. ohg. b=ozan,
   akin to e. beat. see beat, v. t.
   1. a limit; a bound; a goal; the extreme bound; the end.
      1913 webster

            here is my journey's end, here my butt
            and very sea mark of my utmost sail.  --shak.
      1913 webster

   note: as applied to land, the word is nearly synonymous with
         mete, and signifies properly the end line or boundary;
         the abuttal.
         1913 webster

   2. the larger or thicker end of anything; the blunt end, in
      distinction from the sharp end; as, the butt of a rifle.
      formerly also spelled but. see 2nd but, n. sense 2.
      1913 webster +pjc

   3. a mark to be shot at; a target. --sir w. scott.
      1913 webster

            the groom his fellow groom at butts defies,
            and bends his bow, and levels with his eyes.
                                                  --dryden.
      1913 webster

   4. a person at whom ridicule, jest, or contempt is directed;
      as, the butt of the company.
      1913 webster

            i played a sentence or two at my butt, which i
            thought very smart.                   --addison.
      1913 webster

   5. a push, thrust, or sudden blow, given by the head of an
      animal; as, the butt of a ram.
      1913 webster

   6. a thrust in fencing.
      1913 webster

            to prove who gave the fairer butt,
            john shows the chalk on robert's coat. --prior.
      1913 webster

   7. a piece of land left unplowed at the end of a field.
      1913 webster

            the hay was growing upon headlands and butts in
            cornfields.                           --burrill.
      1913 webster

   8. mech.
      a a joint where the ends of two objects come squarely
          together without scarfing or chamfering; -- also
          called butt joint.
      b the end of a connecting rod or other like piece, to
          which the boxing is attached by the strap, cotter, and
          gib.
      c the portion of a half-coupling fastened to the end of
          a hose.
          1913 webster

   9. shipbuilding the joint where two planks in a strake
      meet.
      1913 webster

   10. carp. a kind of hinge used in hanging doors, etc.; --
       so named because fastened on the edge of the door, which
       butts against the casing, instead of on its face, like
       the strap hinge; also called butt hinge.
       1913 webster

   11. leather trade the thickest and stoutest part of tanned
       oxhides, used for soles of boots, harness, trunks.
       1913 webster

   12. the hut or shelter of the person who attends to the
       targets in rifle practice.
       1913 webster

   13. the buttocks; as, get up off your butt and get to work;
       -- used as a euphemism, less objectionable than ass.
       slang

   syn: ass, rear end, derriere, behind, rump, heinie.
        pjc

   butt chain saddlery, a short chain attached to the end of
      a tug.

   butt end. the thicker end of anything. see but end, under
      2d but.
      1913 webster

            amen; and make me die a good old man
            that's the butt end of a mother's blessing. --shak.
      1913 webster

   a butt's length, the ordinary distance from the place of
      shooting to the butt, or mark.

   butts and bounds conveyancing, abuttals and boundaries.
      in lands of the ordinary rectangular shape, butts are the
      lines at the ends f. bouts, and bounds are those on the
      sides, or sidings, as they were formerly termed.
      --burrill.

   bead and butt. see under bead.

   butt and butt, joining end to end without overlapping, as
      planks.

   butt weld mech., a butt joint, made by welding together
      the flat ends, or edges, of a piece of iron or steel, or
      of separate pieces, without having them overlap. see
      weld.

   full butt, headfirst with full force. colloq. "the
      corporal . . . ran full butt at the lieutenant."
      --marryat.
      1913 webster
see also:
beat but butt joint butt hinge ass butt chain 
butt end but end but a butt's length butts and bounds 
bead and butt bead butt and butt butt weld weld 
full butt 

[3] : WordNet (r) 2.0

ass
     n 1: the fleshy part of the human body that you sit on; "he
          deserves a good kick in the butt"; "are you going to sit
          on your fanny and do nothing?" syn: buttocks, nates,
           arse, butt, backside, bum, buns, can, fundament,
           hindquarters, hind end, keister, posterior, prat,
           rear, rear end, rump, stern, seat, tail, tail
          end, tooshie, tush, bottom, behind, derriere,
           fanny
     2: a pompous fool
     3: hardy and sure-footed animal smaller and with longer ears
        than the horse
     4: slang terms for sexual intercourse syn: fuck, fucking,
        screw, screwing, nooky, nookie, piece of ass, piece
        of tail, roll in the hay, shag, shtup
see also:
buttocks nates arse butt backside bum 
buns can fundament hindquarters hind end 
keister posterior prat rear rear end 
rump stern seat tail tail end 
tooshie tush bottom behind derriere 
fanny fuck fucking screw screwing 
nooky nookie piece of ass piece of tail roll in the hay 
shag shtup 

[4] : Moby Thesaurus II by Grady Ward, 1.0

128 moby thesaurus words for "ass":
   rocky mountain canary, siberian husky, act of love, adultery,
   aphrodisia, arse, balling, beast of burden, bigot, bitter-ender,
   born fool, buffoon, bullethead, bum, burro, camel, can,
   carnal knowledge, cheeks, climax, clown, cohabitation, coition,
   coitus, coitus interruptus, commerce, congress, connection,
   coupling, cuddy, dickey, diddling, diehard, dogmatist, donkey,
   doodle, draft animal, dromedary, egregious ass, elephant, fanatic,
   fanny, figure of fun, fool, fornication, hardnose, horse,
   hot number, husky, ignoramus, intercourse, intimacy, intransigeant,
   intransigent, jack, jackass, jennet, jenny, jenny ass, keister,
   last-ditcher, llama, lovemaking, lunatic, making it with, malamute,
   marital relations, marriage act, mating, maverick, meat, milksop,
   mooncalf, mule, neddy, onanism, orgasm, ovum, ox, pack horse,
   pareunia, perfect fool, perverse fool, piece, piece of ass,
   piece of meat, pighead, positivist, prat, procreation, purist,
   reindeer, relations, rusty-dusty, schmuck, screwing, sex, sex act,
   sex goddess, sex object, sex queen, sexual climax, sexual commerce,
   sexual congress, sexual intercourse, sexual relations,
   sexual union, sledge dog, sleeping with, softhead, sop, sperm,
   standpat, standpatter, stern, stickler, stud, stupid ass, sumpter,
   sumpter horse, sumpter mule, tail, tomfool, tuchis, tush, tushy,
   venery, zany

[5] : Easton's 1897 Bible Dictionary

ass
   frequently mentioned throughout scripture. of the domesticated
   species we read of, 1. the she ass heb. 'athon, so named
   from its slowness gen. 12:16; 45:23; num. 22:23; 1 sam. 9:3.
   2. the male ass heb. hamor, the common working ass of
   western asia, so called from its red colour. issachar is
   compared to a strong ass gen. 49:14. it was forbidden to yoke
   together an ass and an ox in the plough deut. 22:10. 3. the
   ass's colt heb. 'air, mentioned judg. 10:4; 12:14. it is
   rendered "foal" in gen. 32:15; 49:11. comp. job 11:12; isa.
   30:6. the ass is an unclean animal, because it does not chew
   the cud lev. 11:26. comp. 2 kings 6:25. asses constituted a
   considerable portion of wealth in ancient times gen. 12:16;
   30:43; 1 chr. 27:30; job 1:3; 42:12. they were noted for their
   spirit and their attachment to their master isa. 1:3. they are
   frequently spoken of as having been ridden upon, as by abraham
   gen. 22:3, balaam num. 22:21, the disobedient prophet 1
   kings 13:23, the family of abdon the judge, seventy in number
   judg. 12:14, zipporah ex. 4:20, the shunammite 1 sam.
   25:30, etc. zechariah 9:9 predicted our lord's triumphal
   entrance into jerusalem, "riding upon an ass, and upon a colt,"
   etc. matt. 21:5, r.v..
   
     of wild asses two species are noticed, 1 that called in
   hebrew _'arod_, mentioned job 39:5 and dan. 5:21, noted for its
   swiftness; and 2 that called _pe're_, the wild ass of asia
   job 39:6-8; 6:5; 11:12; isa. 32:14; jer. 2:24; 14:6, etc.. the
   wild ass was distinguished for its fleetness and its extreme
   shyness. in allusion to his mode of life, ishmael is likened to
   a wild ass gen. 16:12. here the word is simply rendered "wild"
   in the authorized version, but in the revised version, "wild-ass
   among men".
   

[6] : THE DEVIL'S DICTIONARY ((C)1911 Released April 15 1993)

ass, n.  a public singer with a good voice but no ear.  in virginia
city, nevada, he is called the washoe canary, in dakota, the senator,
and everywhere the donkey.  the animal is widely and variously
celebrated in the literature, art and religion of every age and
country; no other so engages and fires the human imagination as this
noble vertebrate.  indeed, it is doubted by some ramasilus, _lib.

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