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

• Ambrosiaceae
• ambrosial
• ambrosian
• ambulacral
• ambulacrum
• ambulance
• ambulance chaser
• ambulant
• ambulant plague
• ambulate
• ambulation
• ambulatory
• ambulatory plague
• ambuscade
• ambush
• ambusher
• Ambystoma
• Ambystoma maculatum
• Ambystoma mexicanum
• Ambystoma talpoideum
• Ambystoma tigrinum
• Ambystomatidae
• ambystomid
• ambystomid salamander
• AMD