Definition that contains earliest
- eohippus earliest horse; extinct primitive dog-sized four-toed Eocene animal
- dawn horse earliest horse; extinct primitive dog-sized four-toed Eocene animal
- genus hynerpeton earliest fossil amphibian ever found; of the Devonian; found in Pennsylvania
- starting point earliest limiting point
- hynerpeton earliest fossil amphibian ever found; of the Devonian; found in Pennsylvania
- terminus a quo earliest limiting point