Ruin is the fallen or destroyed remains of something.(noun)
An example of a ruin is what remains of the Colosseum in Rome.
Ruin is defined as to break or destroy something.(verb)
An example of to ruin is breaking a water glass.
See ruin in Webster's New World College Dictionary
Origin: ME ruine < OFr < L ruina < ruere, to fall, hurl to the ground < IE *ereu- < base *er-, to set in motion, erect > run, rise
See ruin in American Heritage Dictionary 4
Origin: Middle English ruine
Origin: , from Old French
Origin: , from Latin ruīna
Origin: , from ruere, to rush, collapse.
Learn more about ruin