Definition of nucleocosmochronology in US English:

nucleocosmochronology

noun

Astronomy
  • Nucleochronology, especially as used to infer the age of the universe from the ages of the chemical elements.

Origin

1960s. From nucleo- + cosmo- + chronology. Compare slightly later nucleochronology.

Pronunciation

nucleocosmochronology

/ˌnjuːklɪəʊˌkɒzməʊkrəˈnɒlədʒi/