Definition of baryonic matter in US English:

baryonic matter


  • Matter composed of protons and neutrons; ordinary matter, as distinct from exotic forms.

    • ‘So right now the density of vacuum energy in our Universe is only about twice as large as the energy density from dark matter, with the contribution from visible baryonic matter almost negligible.’
    • ‘The results from the VSA and the CBI indicate that baryonic matter accounts for 5% of the critical density - precisely the value inferred from the synthesis of helium, deuterium and lithium in the first minutes of the Big Bang.’
    • ‘The baryonic matter that makes up the nuclei of atoms seems to provide only a small fraction of the total mass in the Universe.’