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

• brachycephalic
• brachycephalism
• brachycephaly
• Brachychiton
• Brachychiton acerifolius
• Brachychiton australis
• Brachychiton populneus
• Brachychiton rupestris
• Brachycome
• Brachycome Iberidifolia
• brachycranial
• brachycranic
• brachydactylia
• brachydactylic
• brachydactylous
• brachydactyly
• brachypterous
• Brachystegia
• Brachystegia speciformis
• brachytherapy
• Brachyura
• brachyuran
• brachyurous
• bracing
• bracken