asterism(redirected from Asterism (disambiguation))
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asterismA prominent grouping of stars forming a distinctive shape but not a complete or recognized constellation. The Plough is an asterism within the constellation Ursa Major. Other examples of asterisms are the Sickle in Leo, the False Cross and the Summer Triangle.
A constellation or small group of stars.
A starlike optical phenomenon seen in gemstones called star stones; due to reflection of light by lustrous inclusions reduced to sharp lines of light by a domed cabochon style of cutting.
A star-shaped pattern sometimes seen in x-ray spectrophotographs.