Definition of Equuleus
: a small northern constellation that is visible between the constellations of Aquarius and Delphinus and that is represented by the figure of a small horse Just west of Pegasus is the small constellation of Equuleus, the Small Horse. Equuleus is easy to identify with its parallelogram-shaped asterism. — Michael R. Porcellino, A Young Astronomer's Guide to the Night Sky, 1990
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First Known Use of equuleus
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