1. equuleus - Noun
2. Equuleus - Proper noun
Equuleus
(astronomy) The second smallest constellation of the northern sky, said to resemble a little horse. It lies west of the constellation Aquarius.
equuleus (plural equulei)
(historical) An ancient torture device, possibly resembling a wooden horse, or possibly a rack.
Other myths say that Equuleus is the horse struck from Poseidon 's trident, during the contest between him and Athena when deciding which would be the superior. Source: Internet