1. (cosmology) one billion (10^9) years
   "the universe is approximately 14 gigayears old"

Encyclopedia: Gigayear

• fulminate of mercury
• fulminating mercury
• fulmination
• fulminic acid
• fulness
• fulsome
• fulsomely
• fulsomeness
• Fulton
• fulvic acid
• Fulvicin
• fulvous
• Fumaria
• Fumaria claviculata
• Fumaria fungosa
• Fumaria officinalis
• Fumaria sempervirens
• Fumariaceae
• fumaric acid
• fumarole
• fumble
• fumbler
• fumbling
• fumblingly
• fume