chiron-

(Greek: Cheiron > Latin, Chiron; a centaur famous for his knowledge of plants)

Chiron, Cheiron
1. In classical Mythology, a wise and beneficent centaur, teacher of Achilles, Asclepius, and others.
2. In astronomy, an asteroid located between Saturn and Uranus, about 100 miles (160 km) in diameter: discovered in 1977.