foal
noun
a young horse, mule, or related animal, especially one that is not yet one year of age.
Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.
I have often heard my father caution him against his wild recklessness, but he would only laugh, and say that the tumble that killed him would be from the back of a horse yet unfoaled.
From A Princess of Mars by Edgar Rice Burroughs