WordReference Random House Learner's Dictionary of American English © 2015
ru•in /ˈruɪn/USA pronunciation n.  ruins, [plural] the remains of a building, etc., destroyed or in decay:the ruins of Troy. [countable] a destroyed or decayed building, etc.:toured the ruin of the apartment house after the earthquake. [uncountable] a fallen, wrecked, or decayed condition:The house fell into ruin. [uncountable] the complete loss of health, means, money, etc.:We'd sunk into financial ruin. [uncountable] something that causes a downfall or destruction:Alcohol was his ruin.
v. [+ object] to reduce to ruin; destroy:Her smoking is ruining her health. to bring to financial ruin; bankrupt:Another lawsuit like that and I'll be ruined. ru•in•a•tion /ˌruɪˈneɪʃən/USA pronunciationn. [uncountable]

Collins Concise English Dictionary © HarperCollins Publishers::

ruin /ˈruːɪn/ n
  1. destroyed or decayed building or town
  2. the state or condition of being destroyed or decayed
  3. loss of wealth, position, etc, or something that causes such loss; downfall
  4. something that is severely damaged: his life was a ruin
  5. a person who has suffered a downfall, bankruptcy, etc
  6. archaic loss of her virginity by a woman outside marriage
  1. (transitive) to bring to ruin; destroy
  2. (transitive) to injure or spoil: the town has been ruined with tower blocks
  3. (intransitive) archaic or poetic to fall into ruins; collapse
Etymology: 14th Century: from Old French ruine, from Latin ruīna a falling down, from ruere to fall violently

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