metallicity
metallicity Lexical Profile
metallicity Game Scores & Validity
• noun
The proportion of the mass of a star, galaxy, or other astronomical object that is composed of chemical elements heavier than hydrogen and helium.
"Older stars found in the galactic halo typically possess a lower metallicity because they formed before supernovae had heavily enriched the universe with heavier elements."
The quality, state, or degree of being metallic or exhibiting metallic physical and chemical properties.
"The researchers applied extreme pressure to the hydrogen gas to observe its transition into a state of high metallicity."
Word Nuance & Usage
In astrophysics, 'metallicity' has a highly specific meaning that diverges from general chemistry: it refers to the abundance of all elements heavier than helium, meaning elements like carbon, nitrogen, and oxygen are classified as 'metals' in this context.
• Rhymes for metallicity
• Nearby Words
Word Origin & Etymology
Derived from the adjective 'metallic' (from Latin 'metallicus', from Greek 'metallon' meaning mine or metal) combined with the suffix '-ity' denoting a state or quality. Its specialized use in astrophysics emerged in the mid-20th century.