The Collaborative International Dictionary
Foal teeth
Foal \Foal\ (f[=o]l), n. [OE. fole, AS. fola; akin to OHG. folo, G. fohlen, Goth. fula, Icel. foli, Sw. f[*a]le, Gr. pw^los, L. pullus a young animal. Cf. Filly, Poultry, Pullet.] (Zo["o].) The young of any animal of the Horse family (Equid[ae]); a colt; a filly.
Foal teeth (Zo["o]l.), the first set of teeth of a horse.
In foal, With foal, being with young; pregnant; -- said of a mare or she ass.