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ortho-dichlorobenzene

American  
[awr-thuh-dahy-klawr-uh-ben-zeen, -ben-zeen, -klohr-] / ˌɔr θə daɪˌklɔr əˈbɛn zin, -bɛnˈzin, -ˌkloʊr- /

noun

Chemistry.
  1. a colorless liquid with a pleasant odor, C 6 H 4 Cl 2 , used as a solvent for a wide range of organic materials.