asterism

/ˈæstərɪzəm/
noun
  1. A group of stars that forms a recognizable pattern but is not one of the official 88 constellations.
    • Stargazers often look for the Summer Triangle, a bright asterism visible in the night sky.
    • The Big Dipper is a famous asterism within the constellation Ursa Major.
    • The Teapot is an asterism in the constellation Sagittarius.
  2. A star-shaped figure or pattern, especially one that appears in a gemstone when cut properly.
    • Gem collectors value star rubies for their rare asterism.
    • The sapphire displayed a beautiful six-rayed asterism when held under a light.
    • The jeweler explained that the asterism in the stone was caused by tiny needle-like inclusions.
Synonyms
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