Definitions:

1. In human context, it can describe a person who participates in foot races or any other competitive running events, such as track and field, marathons, or sprints. NOUN
   • The professional race runner trained rigorously for the upcoming marathon.
2. Refers to a type of lizard, commonly found in the Americas, known for their speed, agility, and ground-dwelling nature, often living in deserts and grasslands. NOUN
   • The race runner darted across the sun-baked desert, its speed helping it evade predators.

Synonyms:

• dash athlete
• marathoner
• racerunner
• sprinter
• whiptail lizards