Plural of equuleus; a genus of small marine fish, or a small constellation in the northern sky.
From Latin 'equuleus,' the diminutive of 'equus' (horse), literally meaning 'little horse.' In astronomy, it names a faint constellation that looks vaguely like a small horse.
Equuleus is one of the dimmest constellations in the sky, so faint you practically need a telescope to see it—yet ancient astronomers named it anyway, probably because they saw everything as horses!
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