Webster’s Revised Unabridged Dictionary · 1913
Foal
Foal (fōl), n. [OE. fole, AS. fola; akin to OHG. folo, G. fohlen, Goth. fula, Icel. foli, Sw. fåle, Gr. πῶλος, L. pullus a young animal. Cf. Filly, Poultry, Pullet.] (Zoö.) The young of any animal of the Horse family (Equidæ); a colt; a filly.
Foal teeth (Zoöl.), the first set of teeth of a horse. — In foal, With foal, being with young; pregnant; — said of a mare or she ass.
Foal, v. t. [imp. & p. p. Foaled (fōld); p. pr. & vb. n. Foaling.] To bring forth (a colt); — said of a mare or a she ass.
Foal, v. i. To bring forth young, as an animal of the horse kind.