equulus

A New Latin Dictionary by Charlton T. Lewis Ph.D. and Charles Short, LL. D.

ĕquŭlus, i, m. dim. [equus],

a small young horse , a foal , Varr. R. R. 2, 7, 13; 2, 8 fin. ; * Cic. N. D. 2, 14, 38.