eq·uid 
(ĕkwĭd, ēkwĭd)
(ĕkwĭd, ēkwĭd)n.
Any of various mammals of the family Equidae, having a single hoofed digit on each foot, and including the horses, asses, and zebras.
[From New Latin Equidae, family name, from Latin equus, horse; see ekwo- in the Appendix of Indo-European roots.]