1. an extinct small horse-like mammal from the Eocene epoch, considered an early ancestor of the modern horse
Usage: paleontology

Examples

• The eohippus was about the size of a small dog.
• Fossils of eohippus have been found in North America.
• Scientists study eohippus to understand horse evolution.
• The eohippus had four toes on its front feet and three on its back feet.
• Museums often display eohippus skeletons in their paleontology exhibits.
• The eohippus lived in forests about 55 million years ago.