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Noun: mass extinction
  1. (biology) a sharp decrease in the total number of species in a relatively short period of time

Encyclopedia: Mass extinction

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masquerade party
masquerader
Mass
mass
mass action
Mass card
mass culture
mass defect
mass deficiency
mass energy
mass extinction
mass hysteria
mass medium
mass meeting
mass murder
mass murderer
mass noun
mass number
mass production
mass rapid transit
mass spectrograph