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

ruin \ru"in\, n. oe. ruine, f. ruine, fr. l. ruina, fr. ruere,
   rutum, to fall with violence, to rush or tumble down.
   1. the act of falling or tumbling down; fall. obs. "his
      ruin startled the other steeds." --chapman.
      1913 webster

   2. such a change of anything as destroys it, or entirely
      defeats its object, or unfits it for use; destruction;
      overthrow; as, the ruin of a ship or an army; the ruin of
      a constitution or a government; the ruin of health or
      hopes. "ruin seize thee, ruthless king" --gray.
      1913 webster

   3. that which is fallen down and become worthless from injury
      or decay; as, his mind is a ruin; especially, in the
      plural, the remains of a destroyed, dilapidated, or
      desolate house, fortress, city, or the like.
      1913 webster

            the veian and the gabian towers shall fall,
            and one promiscuous ruin cover all;
            nor, after length of years, a stone betray
            the place where once the very ruins lay. --addison.
      1913 webster

            the labor of a day will not build up a virtuous
            habit on the ruins of an old and vicious character.
                                                  --buckminster.
      1913 webster

   4. the state of being dcayed, or of having become ruined or
      worthless; as, to be in ruins; to go to ruin.
      1913 webster

   5. that which promotes injury, decay, or destruction.
      1913 webster

            the errors of young men are the ruin of business.
                                                  --bacon.
      1913 webster

   syn: destruction; downfall; perdition; fall; overthrow;
        subversion; defeat; bane; pest; mischief.
        1913 webster

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

ruin \ru"in\, v. t. imp.  p. p. ruined;p. pr.  vb. n.
   ruining. cf. f. ruiner, ll. ruinare. see ruin, n.
   to bring to ruin; to cause to fall to pieces and decay; to
   make to perish; to bring to destruction; to bring to poverty
   or bankruptcy; to impair seriously; to damage essentially; to
   overthrow.
   1913 webster

         this mortal house i'll ruin.             --shak.
   1913 webster

         by thee raised, i ruin all my foes.      --milton.
   1913 webster

         the eyes of other people are the eyes that ruin us.
                                                  --franklin.
   1913 webster

         by the fireside there are old men seated,
         seeling ruined cities in the ashes.      --longfellow.
   1913 webster
see also:
ruined ruining ruin 

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

ruin \ru"in\, v. i.
   to fall to ruins; to go to ruin; to become decayed or
   dilapidated; to perish. r.
   1913 webster

         though he his house of polished marble build,
         yet shall it ruin like the moth's frail cell. --sandys.
   1913 webster

         if we are idle, and disturb the industrious in their
         business, we shall ruin the faster.      --locke.
   1913 webster

[4] : WordNet (r) 2.0

ruin
     n 1: an irrecoverable state of devastation and destruction; "you
          have brought ruin on this entire family" syn: ruination
     2: a ruined building; "they explored several roman ruins"
     3: the process of becoming dilapidated syn: dilapidation
     4: an event that results in destruction syn: ruination
     5: failure that results in a loss of position or reputation
        syn: downfall, ruination
     6: destruction achieved by wrecking something syn: laying
        waste, ruining, ruination, wrecking
     v 1: destroy completely; damage irreparably; "you have ruined my
          car by pouring sugar in the tank"; "the tears ruined
          her make-up" syn: destroy
     2: destroy or cause to fail; "this behavior will ruin your
        chances of winning the election"
     3: reduce to bankruptcy; "my daughter's fancy wedding is going
        to break me"; "the slump in the financial markets smashed
        him" syn: bankrupt, break, smash
     4: reduce to ruins; "the country lay ruined after the war"
     5: deprive of virginity; "this dirty old man deflowered several
        young girls in the village" syn: deflower
     6: fall into ruin
see also:
ruination dilapidation downfall laying waste ruining wrecking 
destroy bankrupt break smash deflower 

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

403 moby thesaurus words for "ruin":
   waterloo, abuse, afterglow, afterimage, ancient manuscript,
   annihilate, antique, antiquity, archaism, artifact, assault,
   atrophy, attack, baffle, balance, balk, bane, bankrupt, bankruptcy,
   barbarize, batter, beat, beat all hollow, beat hollow, beating,
   beggar, beldam, bereavement, best, betray, blast, blight,
   bloodbath, blue ruin, bollix up, botch, brave, break, break up,
   breakdown, breakup, bring to ruin, brutalize, burn, bust, butcher,
   butt, butt end, candle ends, carcass, carnage, carry on,
   cave painting, chaff, challenge, checkmate, circumvent, clean out,
   collapse, condemn, confound, confront, confusion, conquering,
   conquest, consume, consumption, contravene, corrupt, corrupting,
   corruption, cost, counter, counteract, countermand, counterwork,
   crash, crone, cross, crumbling, crush, curse, damage, damn,
   damnation, dash, dead loss, deal destruction, deathblow, debacle,
   debase, debasement, debasing, debauch, debit, debris, decadence,
   decay, deceive, decimate, decimation, declension, decline, deface,
   defeat, defile, defilement, defiling, defloration, deflower,
   deflowering, defy, degeneracy, degenerate, degeneration,
   degradation, degrading, demolish, denial, denudation, deplete,
   depredate, depredation, deprivation, desecrate, desolate,
   desolation, despoil, despoilment, despoliation, destroy, destroyer,
   destruction, detriment, detritus, devastate, devastation,
   devolution, devour, dilapidate, discomfit, disconcert,
   discountenance, disfigure, dish, dishonor, dishonoring,
   disintegration, disorganization, dispossession, disrepair, disrupt,
   disruption, dissolution, dissolve, divestment, do in, dodo, dotard,
   downfall, downgrade, drain, draw, drub, drubbing, elude, end,
   engorge, eolith, expense, fag end, failure, fall, filings, fix,
   flatten, flummox, foil, fold up, force, forfeit, forfeiture,
   fossil, fragments, frustrate, fuddy-duddy, gin, go on, gobble,
   gobble up, gut, gut with fire, hag, hammer, harm, havoc, hecatomb,
   hide, hiding, holdover, holocaust, hors de combat, hulk, hurt,
   husks, impair, impoverish, incinerate, injury, knock the chocks,
   lambaste, lambasting, lather, lathering, lay in ruins, lay waste,
   lead astray, leavings, leftovers, lick, licking, liquidation, loot,
   loser, losing, losing streak, loss, louse up, maim, mangle, mar,
   mastery, maul, mere wreck, mess up, mezzolith, microlith, mischief,
   mislead, mug, mutilate, nemesis, neolith, nervous wreck, nonplus,
   nullify, odds and ends, offscourings, old fogy, old geezer, orts,
   outclass, outdo, outfight, outgeneral, outmaneuver, outpoint,
   outrage, outrun, outsail, outshine, overcoming, overthrow,
   overturn, paleolith, parings, pauper, pauperize, perdition,
   perplex, petrification, petrified forest, petrified wood,
   petroglyph, pillage, plateaulith, play havoc with, play hob with,
   poison, privation, pulverize, put, quietus, rage, rags, ramp,
   rampage, rant, rape, rattletrap, ravage, rave, ravish, raze,
   refuse, relic, relics, reliquiae, remainder, remains, remnant,
   residue, residuum, rest, riot, roach, roar, robbery, rubbish,
   rubble, ruinate, ruination, ruins, rump, sabotage, sack, sacrifice,
   savage, sawdust, scotch, scourings, scraps, screw up, scuttle,
   seduce, seducing, seduction, settle, shadow, shambles, shatter,
   shavings, shipwreck, sink, skeleton, skin, skin alive, slaughter,
   smash, soil, sow chaos, spike, spoil, spoliate, spoliation,
   stonewall, storm, straw, stripping, stubble, stump, subdual,
   subduing, subjugation, sully, survival, swallow up, sweepings,
   taking away, tear, tear around, terrorize, thrash, thrashing,
   throw into disorder, thwart, total loss, trace, trim, trimming,
   triumph over, trounce, trouncing, uglify, unbuild, undo, undoing,
   unleash destruction, unleash the hurricane, unmake, upheave, upset,
   vandalism, vandalize, vanquishment, vaporize, vestige, violate,
   vitiate, vitiating, vitiation, waste, whip, whipping, wipe out,
   wiping out, witch, worst, wrack, wrack and ruin, wreak havoc,
   wreck, wreckage

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

ruin, v.  to destroy.  specifically, to destroy a maid's belief in the
virtue of maids.

Ruin >> R Words
Ruin, definition of term: Ruin
ruin_pag1.html

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