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 aeon, Precambrian period

Type of: aeon, eon

• pyrectic
• pyrene
• Pyrenean
• Pyrenees
• Pyrenees daisy
• Pyrenomycetes
• pyrethrin
• pyrethrum
• pyretic
• Pyrex
• pyrexia
• pyrheliometer
• pyridine
• Pyridium
• pyridoxal
• pyridoxamine
• pyridoxine
• pyriform
• pyriform area
• pyriform lobe
• pyrilamine
• pyrimidine
• pyrite
• pyrites
• pyro-