Etymology
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asterism (n.)

1590s, "a constellation, a group of stars," from Greek asterismos "a marking with stars," from aster "star" (from PIE root *ster- (2) "star"). Originally any grouping of stars, whether a constellation or not; in modern use usually the latter. The "Big Dipper" is an asterism; Ursa Major is the constellation which contains it. Other examples are the "Summer Triangle," "the sickle" of Leo, "the teapot" of Sagittarius.

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Definitions of asterism

asterism (n.)
(mineralogy) a star-shaped figure with six rays that is seen in some crystal structures under reflected or transmitted light;
asterism (n.)
(astronomy) a cluster of stars (or a small constellation);
From wordnet.princeton.edu