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

Encyclopedia: Mass extinction

• quasi-religious
• quasi-royal
• quasi-stellar radio source
• quasiparticle
• quassia
• Quassia amara
• quassia family
• quat
• quatercentenary
• quatercentennial
• quatern
• quaternary
• quaternary ammonium compound
• Quaternary period
• quaternate
• quaternion
• quaternity
• quatorze
• quatrain
• quatrefoil
• quattrocento
• quaver
• quavering
• quaveringly
• quavery