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1[mass noun] The property of being metallic.
- 1.1Astronomy The proportion of the material of a star or other celestial object that is an element other than hydrogen or helium.[count noun] ‘another study of these galaxies shows that they have very low metallicities’
- ‘The Sun's value of x, solar metallicity and Earth's biological time scale were used to help define the GHZ.’
- ‘Scientists can look at stars all over the galaxy and determine the metallicity at the time they were formed.’
- ‘However, independent information comes from extrasolar planet host metallicities, the supernova rate and the metallicity evolution of the Galaxy.’
- ‘The ratio of heavier elements to hydrogen and helium is known as metallicity.’
- ‘Third, by examining its metallicity, we have determined that the Sun is a third-generation star made from several supernova episodes that enriched the local interstellar gas some 5 billion years ago.’
- 1.1Astronomy The proportion of the material of a star or other celestial object that is an element other than hydrogen or helium.
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