1. The eon following the Hadean time and preceding the Phanerozoic eon; from about 3,800 million years ago until 544 million years ago
   - Precambrian, Precambrian eon, Precambrian aeon

Type of: aeon, eon

• guestimate
• guestroom
• guestworker
• Guevara
• Guevina
• Guevina avellana
• Guevina heterophylla
• guff
• guffaw
• Guggenheim
• guggle
• Guglielmo Marconi
• GUI
• Guiana
• Guiana Highlands
• guib
• Guibert of Ravenna
• guidable
• guidance
• guidance device
• guidance system
• guide
• guide dog
• guide fossil
• guide on